Wow! Lots going on all at once. It WILL settle down and get better. After you do the first day at work, things will get easier. It's more stressful because you haven't been for a while. The second day will be easier than the first, then the second week will be easier than the first, etc. You'll have some satisfaction from being a productive wage-earner again. So it won't be ALL negative. You can do this--just take deep breaths and try to find something peaceful or soothing you can do as others have suggested. Maybe plan a reward for yourself when you get your first regular paycheck again--take some money out to buy yourself something you'd like.

I think, too, that you are entirely sane, just stressed out and uncertain about the new meds. Take care of yourself, for you--you deserve it!