yes gracie, people are prescribed Welbutrin either in small repeated doses daily or in the time release form for a reason. I am SO sorry you got into the practice of snorting it. That entirely changes the picture.
are you still using? Due to real medical issues you may NEED to taper. My sincere suggestion to you is to go to a/your psychiatrist and tell them what the situation is so they can tell you how best to get safely off Welbutrin.
They will have enough experience with the drug and it's effects to give the soundest suggestions for success and safety.