Welcome to the forum, js.
We're not doctors here, so all we can do is commiserate. It does sound like a difficult problem!
Are you sure the bed bugs are completely gone? It takes cleaning over and over, getting rid of mattresses and clothes ... Well you probably know after going through it.
Have you seen an allergist? The spots could be a reaction to more bed bugs or a delayed reaction. Or maybe a reaction to cotton or something - I have a friend who can't tolerate any natural materials. Detergents also cause itching and could be worse when you sweat. I use only All Free and Clear and always double rinse everything.
You might look up (search box at top of page) how to keep a food journal. I have to do that for all my food and drink and medicine intolerances.
Sorry about the depression - way out of my league. There is a depression forum here at HW. I'm not qualified to tell you what to do, but don't think alcohol helps anything.
Best wishes. I hope you'll let us know how you're getting on.