this paragraph will be a mess but here was my situation
Yes. I've had this happen to me, I've been on vyvanse for 4+ years and the doses ranged from up to 100mg a day, to 60mg now. Stimulants can cause anxiety, or cause any existing anxiety to be worse.
Personally it took a few months for me to learn how to deal with my anxiety, I took breaks off my vyvanse for days and weeks over the course of a year. I wouldn't cold turkey this because of the horrible side-effects, especially if you're still in school.
Anyway, back to the point, a few months I tried a lot of things, first I tried St. Johns wort and this helped with depression and a little for anxiety. The problem with it is it takes a whie for St Johns wort to build up in strength, so you have to take it every day for a while, I'm on Zoloft and that helps too, I'd recommend seeking therapy or trying new medicines.
i was in a boat where I couldn't really get effective medicine treatment so until I did, I turned to cardio and excercise. Otherwise, there's things like breathing techniques to control anxiety, and having a small sketch book and drawing random things to help cope. if you're interested in some techniques tell me and I'll put them on here later when I'm not busy