the problem when self medicating with street drugs is that you do not know what is in there. You might as well think it is meth but it could just be ephedrine. i mean how can you know. What is certain is that even if there is some real stuff, it is still very inpure and the inpurities can be anything. be careful.
Better try sudafed and some l-tyrosine supplements or try to aquire some pharmaceutical grade ritalin. it is still risky and must be careful what you are doing but at least you are gettin a standard dosage and can adjust more easily and reduce the risk of addiction. I surely reccomend l-tyrosine about 1000-1500mg daily. it wont hurt at all as well as a multivitamin. also do not expact immidate results but try to get into the habit of taking it in the long term as see (after a month) if id did make a difference