Sounds like you're on the cusp of some sort of change and feeling anxious about whether the decisions you're going to make are "right" or not? (I'm not entirely sure, so do correct me if I got this wrong).

The agony of overthinking is so much less potent than the tragedy of it - because when you panic about an oncoming change, you live through the panic once, experience panic if something does happen to go wrong again while it's happening and then of course spend time reliving and repenting. My sense is that no change is not-undoable, no mistake is unfixable, unless you've killed someone, which I'm assuming you're not considering, and there is PLENTY of time to regret later. Maybe it would help to know what you really want in the first place. (it's okay to want stability inn the face of novelty and change, but which is stronger - and which would be destrcutive if it did't happen?)