Thanks for your query.
I will try my best to provide you with best possible professional recommendations to your questions.
I advice you to go to rehabilitation
center which is good for you and also to the other persons involved in your life.
Long term effect of meth
and Delusions are common. It is difficult to tell whether there is something wrong with your elbow.
As you are injecting it you are more prone for infection, needle or the injection Technic may not be sterile.
As you are addict it is better to meet the doctor and get yourself examined and i also advice you for de-addiction.
Yet again, I do hope that you have found something helpful and I will be glad to answer any further query.