withdrawal symptoms of wellbutrin

My husband has PTSD and has been taking, I think 150mg or 200mg of Wellbutrin each day.  He had a CT scan done and decided to stop taking the meds because of the chance of a siezure(his decision not the the doc)He has not started back. It has now been 4 weeks, and he feels like CRAP.He has a headache, wants to do nothing, fuzziness in the brain, tired all the time. He is worse than he was before he started on any meds. Depression is worse.  Is this the result of going off the Wellbutrin cold turkey?, or just the PTSD and depression returning because he is not on any meds?

Thanks,

Linda