Do Exercises And Vitamins Help To Keep The Depression Away?

I am on Welbutrin 150 xl and have been for 7 years. I recently took it a few hours later than usual 3 days in a row. I noticed on those days that I was perkier and more patient until I took it. Afterward, I was very hostile--irritable and even slammed books down on a table when my kids weren t obeying. I have struggled with my short fuse for so long now--and thought it was just stress...but realized it isn t my nature....it all begin with welbutrin. I want to wean myself off--& see if exercise and vitamins can keep the depression away. How can I wean myself off--and fast? I don t like the irritable person I have been.