Horrible effects from Zoloft withdrawal

I'm 20 years old, and I have been on Zoloft since I was 13 for anxiety and panic disorder. Within the last year or so, I have been so tired that I can't even function. My GPA is slipping, I sleep 12 hours a night and still have to take a 2 hour nap in order to get through the day. I thought there was something physically wrong with me, and after getting all sorts of tests done, I was told everything was normal and I am perfectly healthy in every way. So that left only on thing - the Zoloft. I moved and got a new psychiatrist, who I talked to about the issue. He lowered my dose from 150 to 100 mg, and although I had no side effects from that, nothing changed with my fatigue. I went back in and said I was still tired and had severe concentration issues because of it, and he diagnoses me with ADD.. what the hell. So he prescribes me Adderall, which helps a LOT with the fatigue, but I hate taking it because I feel like it just masks the initial problem. I have told him this NUMEROUS times but he can't wrap his tiny brain around the fact that I NEVER HAD ADD IN THE FIRST PLACE, and keeps encouraging me to take it.
So fast forward about a month, and I get really fed up with my fatigue (along with weight issues, sexual side effects, and depression) and demand that he switches my medicine. He prescribes Wellbutrin, and tells me to take 150mg of that and 50mg of Zoloft for 5 days, and then quit the Zoloft and move up to 300mg of the Wellbutrin after that. I thought 5 days was definitely not enough time to wean off of the Zoloft, but I was so fed up with the side effects that I decided to do it anyways. It has been a week since I have taken the Zoloft and I feel like I'm about to fall apart. My eyes are so heavy that I can barely keep them open, I'm ten times more fatigued than I was before, I get dizzy every time I stand up, and I've been in bed for the past 2 days. I also have been very irritable and mean, which is something I have never had a problem with before. I threw my phone at the wall, tore down my shower curtain, and screamed at my boyfriend for no reason. Not to mention the brain zaps, which are scaring the hell out of me.
After reading a lot about Zoloft withdrawal, not once did I find someone who was advised to quit it in the short amount of time that I was told to. I am so angry I feel like I'm going to explode. How can a licensed professional give me such horrible advice? And I'm paying him for this c**p, too.
Since my psychiatrist is completely useless to me now, I was wondering if you all know how long I'm going to feel this way? Luckily I am on fall break right now, but in 3 days classes start again and I can't even get out of bed. My professor takes 2% off of your final grade every time you miss a class. I can't take this. Should I just take some Zoloft to make my mind shut up, or what?