Sad feeling symptoms and conditions

I was taking Lexapro for anxiety, but was having sexual side effects. I went to a Psychiatrist, who gave me a few options, and decided to go with Wellbutrin. He started right off the bat on 300mg, and for the first week or so didn't feel too much change. Then, about the beginning of the third week I had terrible nausea and dizziness. I was scared to drive to work some days. I also feel as though I am becoming emotionless, and have a general melancholy feeling. The nausea and dizziness seems to be getting better, but if the sad feeling doesn't subside, I believe that I will discontinue use.
On the bright side, the sex has been great!

I have been on singulair for several months or more. In the last month or so I have had a handful of breakdowns emotionally, crying like a little baby some worse than others. I feel paranoid but i don't know if that is just a case of anxiety.Leaving the house has become an issue if it is a bad sad feeling day. I just learned about an investigation tonight and googles it. It lead me here.

I don't know what to do.

Effexor XR worked at getting rid of a deep depression when nothing else seemed to help, made me less irritable and more pleasant to be around and rekindled some long-lost interests and made me less reactive and defensive.. AT FIRST.... within a couple months I found myself in a numb kind of depression, there was this irritable sad feeling in my head that I tried to get rid of by eating sweets, something I was never to fond of. I packed 20 pounds on my 5 foot 1 frame which is several dress sizes. I would have gained more if I didn't have periods of dieting and exercising here and there, but mostly I wasn't motivated, I would do things like sleep through doctor's appointments and not even care.. My sex drive was so gone I started thinking I was asexual, no joke.. I kept on craving junk food and couldn't stop, I also couldn't sleep at all.. It felt as if my stomach to my groin area were numb, that's why I kept on eating, to see if I could feel something but I never felt full... To me sleeping, having an orgasm and feeling full are basic human functions and to take them away is well.. depressing... I choose to accept my brain chemistry as is , that was part of the problem, feeling like we have to be happy and smiling all the time... My personality "flaws" are automatically cured when I accept them cause' they are no longer flaws and that makes me more positive and happy!