Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.

I think you need to go back on a 1/2 dose of wellbutrin, and stay there for three or four months, and then halve it again for three to six months. But without knowing what you've started with, I have no idea where you sit on this scale.
Doesn't sound like a taper to me. In any case, follow your doctor's advice ... to the letter.