I'm so tired

I'm so tired of feeling meh all the time. It's like I do all day is try to distract myself until it's time to go to bed. It's like I suddenly can't do anything fun anymore, and yet I still don't want to do anything productive because I'm ADHD, so I just sit here for large spaces of time doing nothing. I don't know if this is some kind of depression or burnout but it's driving me slowly insane.