As far as those job interviews go, try to smile more and be as friendly as possible. Even if it's a job that you're not thrilled about staying at for five years, go in excited at the prospect of having a job again and making money. If you're excited and ready to learn, you're more likely to be hired.
Thoughts on self-medication: It's not really a "prescription" if someone hands you a bottle and says "Take some of these." At one time, you and your doctor talked about your problem, and your doctor told you to take x number of pills y times per day. I wouldn't feel uncomfortable going back to the original dose of medication that was prescribed. Just make sure you try to remember the
original dose; if the problem was ongoing, your doctor probably increased your dosage once or twice.
And, finally, exercise. Get up early and just don't let yourself do anything else before you exercise. You really have no idea how good it will make you feel until you start doing it.
DON'T let yourself skip days! If you feel sick, do
less, but still do SOMETHING. Don't let people sway you. Be obstinate. Your body will start feeling better, and you will start feeling better about your body, which will make you feel
awesome.
I would say "good luck", but luck isn't involved. Instead,
get started!