I Am Coming Off Of Paxil. I'm Going On Wellbutrin.

I am coming off of Paxil. I'm going on Wellbutrin. For now I am on both low doses. I don't feel myself. It is two weeks. I'm tired all the time and I have a bad headache. Today is my day off,t can't get out of bed,my head&ebonies hurt. Is it the Ned's or am I getting sick