For the repetition of ἀλλά, so soon after the “ἀλλά” in 137, see 879—882: Ph. 524 n.
ἀπὸ τῶν μετρίων: deserting moderation (“τὰ μέτρια”).
ἀμήχανον, admitting of no alleviation, like “νόσων ἀμηχάνων” Ant. 363(n.).
ο̂ιόλλυσαι here =“προβαίνεις διολλυμένη”: cp. Dem. or. 21 § 139 “φθείρεσθαι πρὸς τοὺς πλουσίους”. With the help given by “ἀπό” and “εἰς”, such a sense for the verb is not forced. It would be harsher to evolve the idea of motion from “στενάχουσα”.