Meth will cause bad mood problems it will keep you going for days and then boom you have to sleep for a day or to. 6 years of use probably has messed your thinking up. Adhd is Attention deficit hyperactive disorder that kids from drug addict parents are born with. If you would leave the meth alone your mind would return to normal 6 years is not that bad but you are crossing the line and the damage that meth does is unreal the life span of a hard core meth addict is only 50 years and some dont make it to 50 so get into rehab to save you from your addiction. Let go let God or a higher power.