I am having a severe depression. My doctor is switching me from Zoloft to Viibryd. I have taken Zoloft for 15 years and my Dr. wants to wean me off of Zoloft over the next 2 weeks and then I can start the Viibryd. I'm scared in the depressed state I am in right now to cut back the Zoloft! Is there another way to switch these 2 medications?