Need Help With HW Motivation

I've always struggled with homework motivation, but right now it's so bad. Even on my ADHD meds, I can't seem to sit and do the work. It's not like I have a ton of classes, I'm taking TWO classes right now and one of them I have no issue doing the work. It's just my US History course I'm having trouble with. I think it's because of the amount of reading and lack of comprehension. I've never really enjoyed history.