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Hello and thank you for your question.
Obviously you would need to check this with your prescribing doctor or psychiatrist, but there is an antidepressant that many people find does not inhibit sex drive or ability to achieve orgasm, and also does not cause weight gain. In fact, the medication can help with both. It's called Bupropion. It's a non-tricyclic medication and definitely could be worth a try for you.
Of course, depending on what your local doctor has to say about this as a possibility for you. Here is a link that describes this medication: http://en.wikipedia.org/wiki/Bupropion Please click ACCEPT button, so I'm credited for my help today. Thank you and best wishes...