Wellbutrin and fillers

I switched from the small round white generic Wellbutrin to the large round yellow Wellbutrin 2 weeks ago. Not to my agreement, I just picked it up at the pharmacy and there it was. Anyway, today I went to the doctors for a rash and she told me that different manufacturers have different fillers in the pills, so I could be allergic to one of the components. I took my new Wellbutrin back to the pharmacy and the pharmacist gave me my old generic brand. The rash was on my stomach, the hips, my back...and it appeared Sunday night. Just a story in case anyone is experiencing something similar. If this doesn't make my rash go away, I will report back to let you know it in fact wasn't the change.
******

pic of the different pills.

******

pic of my rash

I have been on generic Wellbutrin for almost two weeks and have not gotten a rash but have noticed that my anxiety has gone up, especially at night. I already have anxiety about not sleeping and normally will take benadryl or lunesta to help that. I also feel like I have this surge of anger, that I am not sure where it came from. Has anyone else had this? I talked to my doctor yesterday and he said to follow up on Friday and see. I am switching from lexapro to wellbutrin because of massive weight gain and to help me quit smoking. Any advice would be grateful, I can deal with it if I know its going to pass shortly!!