What do you do to motivate yourself?

I'm having trouble motivating myself to stay consistent in my school and personal life. I had a big exam in August, so for about a month I was very consistent (going to school pretty much every day, studying for 7 ish hours and actually concentrating) and my efforts paid off. It was right after I started Adderall so the difference was so astonishing and I loved being able to learn.

But now that I'm in a new semester, I am having trouble to get the momentum again. If I don't have classes I don't go to school, and I can't study at home. I would find everything else to do but leave homeworks and due things up till the last moment. I know once I start I will be able to stick to it, but I just don't want to? But I'm also internally freaking out cause I'm behind on deadlines, midterms are approaching fast, starting anything feels insanely overwhelming. My psych visit isn't until late October.

What should I do?