I took 300 mg. wellbutrin about 1 1/2 years ago and did not react...

I took 300 mg. wellbutrin about 1 1/2 years ago and did not react well to it. I just quit taking cymbalta after about 3 months because of sexual side effects, but here is the kicker. I started on a lower dose of wellbutrin about a week ago (175 mg xl) after only 3 days I was so screwed up it was a no brainer that I could not take it. It has been 4 days since I quit and I am still getting waves of disorientation and mild panic. How long will this last. Damn I only took it for 3 days and the side effect have lasted 7