I agree that sometimes medications may be over-prescribed, but it's not necessary for anyone to claim that not a single person in the world needs psychiatric medication. Many people undergo years of therapy, decisions to "forget the anxiety" or whatever the problem is, and other non-pharmacological treatments, yet still remain incredibly suicidal, or have so much anxiety that they can not hold a job or even leave the house (not to mention have fulfilling relationships with other people). Its' easy to see a few high schoolers unnecessarily prescribed Ritalin or Prozac and say "Down with all medications, no one needs those!" but when you are sitting in the psych ward next to your mother who has been diagnosed with bipolar disorder, who is now $20 000 deeper in debt because of her last spending spree during her mania and bleeding from her wrists after slashing them almost to the point where she has successfully killed herself in her following depression, and this is her fifth suicide attempt and the entire family is now falling apart, you may see that yes, indeed, some people actually need medications in order to live any semblance of a happy or productive life.
I assume that Pmz is not nearly that severe of a case, but the point is that we DON'T KNOW what is going on with him. There may be a severe or moderate mental illness that was either present for MDMA, or was brought out by the drug. Telling him to stop his medications without having any knowledge of any of this stuff may be extremely dangerous advice.
The "quack" psychiatrist he saw went through twelve years of university to become a psychiatrist (if he was educated in Canada/the US) and while that doesn't necessarily make you a genius, it certainly is a lot of education about what happens in the body and the brain, and a huge chunk of that is around understanding the important things about how meds work.
Pmz: If you are on a psychiatric drug, there should be a psychiatrist or family physician monitoring you, even monthly, to adjust doses as needed or take your concerns into consideration. You do need at least a family doctor to be re-writing your prescription every now and then so talk to that doctor about it. Two months is usually long enough for the med to be doing its job properly so if you're still struggling on the medication then it's completely your choice if you want to try something else or stop altogether, but please involve your doc in this process if you choose it!