I think this topic may get more attention in ODD or BDD but I'm very new to actually posting here so I'll leave that to a mod.
as far as your concerns go it sounds like you're building a tolerance. that's my best deduction without knowing how often and how much you're using. you probably (pretty much definitely) have damaged your dopamine levels/receptors which would be why you're not getting the same high anymore, seeing that meth mainly affects dopamine.
if taking a break to recover dopamine and lower tolerance isn't an option for you, search the site for amphetamine tolerance reduction, there's a giant thread with loads of information on potentiation and tolerance reduction for amphetamines. magnesium is a popular one for lowering tolerance, and there are loads of other supplements you can take to speed up your brains regeneration of all those great feel good chemicals that meth stimulates/depletes. these supplements paired with a break and lots of sleep will be your best bet, but supplements and potentiation make a huge difference...and sleep is incredibly important
hope this helps!
