I have not slept properly or eaten a full complement of meals in over a week. I am now, predictably, outside of my mind.
@coelliptic sleep (as much as possible) is the big thing. Have you tried something like melatonin, or preferably talked to a doc?
This isn't the first time, and maybe getting in with a psychiatrist is in order (if you haven't). They may have options that don't include Ambien.