Do I need to see a doctor (it's not that serious)?

I was on Wellbutrin for about 3 weeks until I went on a trip and got off track with taking it. I hadn’t taken it in about 4 days until I started up again. The following night I was extremely itchy and would get very large, red welts on my skin in the pattern of my scratching. It became unbearable, so I took some benadryl to alleviate the itching. I don’t know if it worked or not because I feel asleep.
That was last night. Again, tonight I’m itching like hell and am getting the welts after I scratch. I took some benadryl again, but does anyone know if I should see a doctor, or would it be ok to just wait it out? Also, I haven’t taken any of it since.