Sounds sorta like Bipolar and sorta like sex addiction. Could be both, I have a friend with bipolar and 4 addictions, alcohol, pot, gambling and sex. As for bipolar, well I went on a manic tear once where I had sex with 2 different hookers 3 times between them. I ended up getting an STD and having to tell my wife who was very supportive and laughed at me and started drinking to spite me (I abstain). It's something she still laughs at me about.

I'd say if the meds help it's probably bipolar.