Attention Deficit Hyperactivity Disorder

I am in need of some advice as I face a serious problem. I believe I have something called ADHD/ADD (Attention Deficit Hyperactivity Disorder/ Attention Deficit Disorder). This results in me procrastinating to a very large extent and it leads to depression. I can barely get down to work and when I finally do I can not keep my concentration sustained at it. I constantly feel sleepy yet when it is the right time to sleep I take hours
obtaining sleep which results in me falling asleep at around 4 am or later (nowadays I just resort to staying up later and reading tahajjud and fajr.
This does have really bad consequences as I am a student at university. But I try really hard to resolve this but I feel as though I no longer have a will. Please advise me, this problem I have suffered for many years and now that I am alone in university it has only intensified. I make duaa that Allah helps me find a solution through this means insha'allah.