Yeah, I used to love them little buggers myself ... addies, dexies, ritalyn ... all those adhd meds are just like pharmaceutical meth (amphetamine).
On a positive note, it's pretty hard to od and die from amphetamines unless you already have an existing heart condition, but that is not to say you won't start acting and feeling VERY strangely if you take too much, especially since you end up not getting enough sleep or nutrients. I used to stay up for days on end on amphetamines, and remember well the hallucinations (esp. the auditory ones, hearing voices, etc) that come along with the lack of sleep.
But just cause you aren't likely to keel over and die from them doesn't mean they're not dangerous, cause they are. They are VERY hard on your body and mind, and they will shorten your life big time if you abuse them for too long. Not to mention the kinda crazy stuff you might do while you're strung out on 'em.
Sounds like getting yourself into a detox/rehab program is in order my friend.
Good luck, and keep posting