There is no easy way off stimulants, I know
... you just got to walk through the fire and keep on walking.
Liver failure from acetaminophen poisoning is really a bad and ugly thing. It's worse than getting off the speed. So stop that madness right now, unless you want a painful gruesome death or near death experience... and if that is what you want, please go to the hospital now and get help.
I believe there is CMA, crystal meth anonymous:
Crystal Meth Addiction Hotline
Call them