Any idea what I'm going to feel like after going off this ADHD drug (Vyvanse)?

My psychiatrist put me on a considerably high-dose of Vyvanse. It turns out it was too much. I didn’t realize how much it was messing with my head. Tomorrow is my last dose; he basically wants me off of it ASAP, as it was causing some ideas of suicide. I’ve come across conflicting literature, but it seems as far as amphetamines go, there isn’t too much to worry about. I’m really, really hoping it’s just fatigue. I know it’s a long-shot, but does anyone have any experience with this? Thanks.