Dizzy

Dictionary.com explains it all:

dizzy: (diz-ee)
adjective
1. having a sensation of whirling and a tendancy to fall; giddy; vertiginous.
2. bewildered; confused.
3. causing giddiness or confusion: a dizzying height.
4. heedless; thoughtless.
5. Informal. foolish; silly.

See also, vertigo, nausea and vomiting...