Antidepressant insomnia: I would not wish this upon my worst enemy

I was prescribed Wellbutrin XL for my anxiety and ADHD and it has completely fucked my sleep schedule. I have to get up at 6 every morning for an early class at my high school and I haven't gotten more than 4 hours of sleep this entire week. Every waking moment it feels like someone is pushing in on my temples and rubbing sandpaper across my forehead. It's getting to the point where I feel like the side effects are hurting me more than the drug is helping me. I have these rare moments in the afternoon sometimes where I just get overwhelmed by a tired feeling but I always have to get up to do something and then it's gone for the rest of the day/night. With ADHD-I my working memory is already compromised and I mentally cannot function when that's combined with only 3 hours of sleep. I have this huge AP Gov test tomorrow and I only have 4 hours left to even fall asleep. I feel like I'm going insane