What do I do?

I thought after 4 years of working on fixing myself, that my symptoms were mostly gone. I started dating again after a couple years and in the last few months started a close relationship with someone... now I'm starting to flip out randomly again and I am scaring away this person I love with my erratic behavior. 

After my SO had forgiven me and more or less gotten over the last freak out, we had a really great day. Told me it was the happiest one in months. And then the following day I act like a nut again!

I think a large part of it was caused by a bad reaction to new medication (Effexor and Wellburtrin). Wellbutrin put me into a manic state. Off of it now and finished tapering off of Effexor as of today. Going to stop drinking too, it was precipitated by being very drunk.

I'll note that until I got on Wellbutrin, I had ZERO issues and we were getting along great, regardless of whether I had been drinking or not. But, there's only so much I can blame on medication...

Please help, I am tired of being this way. Therapy has been useless. I feel like such a fuck up.