Severe weakness and fatigue with Kevzara?

I did a dumb thing. Went off anti depressants ( Welbutrin wasnt helping with depression and fatigue anyway) and started Kevzara about the same time, a little over one month ago. My fatigue weakness and dizziness have become overwhelming. Rheumy says it's not from Kevzara, yet the paperwork says it can cause this. I am not functioning on any level. Now headaches and diarhia. Went to regular doctor, lots of tests, and they dont know but suggest I go back on Welbuttin. Of course that will take weeks to kick in. Suggestions appreciated.