If i were to try and guess why your bones hurt when you do the " not meth" then it's either the cuts that they use or you have arthritis or something. The " not meth" that you are using has agents in it that could probably cause damage to all kinds of things because nobody really knows nowadays what they are putting in the " not meth". Could be any chemical really.
Mexico imports all kinds of things ( legally ) and probably switches up what they use depending on which chemical is cheapest that week.
It really is a losing game nowadays because the Mexicans got heavily involved and can get all kinds of nasty chemicals cheap and easy at the touch of a button.
The fact that you call it " not meth " is really your answer because it's really not meth and could just be an RC with some obscure shit added. I'm surprised they don't lace it with arsenic every once in awhile just for shits and giggles. They know we will buy anything the dealers offer up and just how gullible we really are when we want our fix. In todays world it is such a gamble and a roll of the dice.