Allergic reaction to bupropion sr

I had been taking bupropion sr 300mg for about 3 weeks and then broke out in hives.  This medication is the only change in my life.  No new soaps, shampoos, etc.  When I called my doctor, she was out of town for the next few weeks, but the resident doctor told me to stop taking the med and follow up with my doctor when she returns.  I do have an appt with my doc next Wednesday.  I have been off the med now for two weeks, but I am still having some itching.  The large, red hives took about four days to go away.  They were mostly on my legs, arms and waistline area.  Plus my hands and feet were swollen, red and very itchy.  Then after the large hives disappeared, I ended up with smaller bumps that itched.  Now I just have mild itching every once in awhile either on my legs, arms, neck and back.  Could this still be from the med or maybe from the stress over everything in my life that the bupropion was supposed to help?  Any thoughts would be appreciated.