At the risk of stating the obvious, sounds like you are caught in a spiral of projecting into the future what might happen. I guess that is what anxiety is largely. And one antidote is to find any sort of practice that brings the mind into the present. Meditation would be the classic one. But for me playing guitar kinda does it.

Even becoming aware of these patterns can be helpful for me sometimes. Or just a post-it on my computer saying "be present dumbass".

Anyway, not giving advice since that is not usually what people need, and it may well be that your distress is too great for this kinda of stuff, as mine often is.

Sorry for the rambling just thinking out loud.