If you have symptom changes from quitting prozac cold turkey, you may want to read some of these discussions about that.
Psych Central - Search results for Intimacy

You are lucky to have a husband that cares and wants you to stay awary from SI.

I am wondering why you do not go through normal medical channels to get Welbutrin legally if your doctor agrees that would be a good move. Self medicating can be a twisted path to take and you might find it is not what you hoped for. Doctors use scientific method to combine drugs in ways that do not interact or produce side affects.

I think risky behavior like trying to self medicate is sign that if you are not already in a bad place, you may find yourself there. Please go to your doctor for medication. You are bound to stay healthier.