I was recently on Celexa (about 6 months) but I did not like my side effects so about 3 months ago, they switched me to Paxil. I gained extreme weight, which was ironically depressing and when I ran out I just stopped taking it...I know this is not wise but after three days with no withdrawals, I figured I'd be okay. Almost two weeks later, I went to the doctor (this past Thursday) and told them I had quit taking it and why so they put me on Wellbutrin. I've only been on it for 3 days...so I'm not sure what's going on but starting yesterday I have experiencing sever dizziness, nausea, bursting headaches, heart palpitations with shortness of breathe. Today it's been going on for 4 hours now.