My doctor put me on Wellbutrin due to weight gain from Celexa and also because I need help to quit smoking. He thought this was the best avenue. Since I've been taking the Wellbutrin XL (3 weeks) I have had a significant increase in my depressive state, as well as anxiety and severe irritability. It is also wreaking havoc on my marriage. What is the best way to wean from WXL 150mg back to my Celexa 40mg?