First, Never that Easy had been asked to diarise her pain levels and had a conflicted response to seeing it all mapped up.
“I want to print it out and stick it on the refrigerator, or e-mail it to everyone I know or ever met and be like: "See?!? This is what it's like to be me: This is what I'm dealing with. Look at all those 5s and 4s!!! Now ask me again why I'm not working but instead 'sucking up your social security'!" At the same time, I want to hide it... I'm a little bit ashamed of it, that it's gotten this bad. I want to ignore it, to not have to face it.”Meanwhile, Seahorse has been dealing with a sister.
"But no, apparently I'm not disabled because I walked in town last weekend. This 'miracle' proves that I am not disabled. Forget the fact that I was in bed for several days after, and went straight into a wisdom tooth infection.Since then, Andrea has also touched on this in her excellent You just don't get it
Oh, and my eyes burn too brightly these days, apparently."
Frida Writes has also written eloquently on this subject in the past, and both Gone Fishing and Cusp have long-running battles with insurance companies which involve this issue.

Despite the way that systems work in real life, the practical, medical and financial help sick people receive is still regarded by many as a sort of charity. Often even equality legislation is spoken about as if it is out of compassion that employers and service providers should accommodate us. Charity is act of generosity and kindness, whereas social justice is about the duties we have toward one another. Charity, unlike insurance, requires recipients to be deserving as opposed to merely entitled - and there is an enormous difference.
This model enforces a power dynamic between non-disabled and disabled people, particularly those of us who are need lots of practical, medical and financial help. This makes it socially acceptable for non-disabled people to speculate about our varying degrees of "legitimacy". There is nothing worse than an undeserving charity recipient, and they must be rooted out.
People with chronic physical or mental illness perhaps bear the brunt of this because our stories are untidy. We have symptoms which are invisible, which fluctuate and which seem to be on a spectrum with normal experience (fatigue is extreme tiredness, depression is extreme sadness etc.). If ever challenged, it is impossible to prove our degree of impairment - there are no blood tests or scans which demonstrate how much something hurts, how difficult it is to concentrate and so on.
All this makes doubt very hurtful and threatening. To the extent I may be said to have achieved it, it has taken an awful long time to stop feeling guilty about the cost of my existence to everyone else, to stop feeling a need to justify myself, to demonstrate that I've done everything I can to get better and I do everything I can to spend my time productively.
Thus the first problem in dealing with doubters;
Self-doubt.
The first rule of dealing with doubters is to realise that your experience is legitimate.
Most people with chronic illness will, at some point, have doubted themselves. Denial is a standard stage of grief, so having phases in which we doubt our own perceptions of illness is entirely natural – if rather uncomfortable. The last time I had this was only last year, when my pain got worse. It was so bad, it was actually difficult to believe what was happening, even though it was intruding into my consciousness twenty-four hours a day. Even now, I wonder whether I can be remembering right, but then my pills are very good.
So doubt makes some psychological sense, but not logical sense. It is possible to have erroneous beliefs about an illness (what it is, what its caused by etc.), but that doesn't make your illness illegitimate. A symptom is a symptom. A symptom may be entirely imaginary, but it is still real to the person experiencing it – and considering that possibility won't make it go away (or it might, but if it did, you wouldn't have the problem any more).
Self-doubt can be dangerous as well as demoralising. It can delay us getting the medical help they need once scary symptoms kick in. But I guess people with chronic illness probably have to go through it, and revisit it from time to time. People who never doubt their own perception of reality tend to end up starting religions, invading small countries or dedicating their lives to provide goats with glamorous eveningwear.
Our sense of legitimacy is more than whether or not we trust our experiences. Because of prominent models of disability, we often inherit odd ideas about whether our experiences count enough to ask for help or reasonable adjustment.
For example, lots of chronically ill people refuse to identify as disabled, even though chronic illness is responsible for some of the most severe functional impairment and attracts some of the worst disabling treatment (especially mental illness). People often don't claim benefits and services they are entitled to, because they don't see their needs as great enough. Lots of people who have very poor or painful walking wind up stuck at home rather than using wheelchairs, not always through shame, but rather a sense that wheelchairs are for people who can't move their legs.
When we do accept what we're entitled to, we've often had to justify this to ourselves and thus almost expect to have to justify it to other people. But the worst thing we can do is to fall into the trap of thinking we have something to prove. Dealing with doubters is about dealing with other people's problems in order to make both our lives easier.