Wow. That supervisor's remark about the meds was waaaaay out of line and should be brought up in any legal action you take against this employer. It was none of her business, it was inappropriate and discriminatory, and it'll get her barbecued in a hearing.

I think you are probably right about this being political. You are bipolar and have manifested symptoms, therefore you are unreliable (in their minds). This has got the ADA written all over it, not to mention wrongful termination. Go for their throats, FF, you've got nothing to lose and possibly a lot to gain.