Quit injection

I have been injection my ADHD medicine for a over a year now. I have try to quite and did so over two months but I end it because I was so tired al time. If I don’t do it every day I really feel so tired so a fell asleep now madder what I doing. Have feel a sleep staying up and even in a sentes so that I say crazy thing instead of that I intended to say. Have try to change medicine and take amferamin nothing works. I don’t want to lice like this so help how do a stop this ? Thanks