You're 15 years of age and now you know how good that feeling is when you take ecstasy or cocaine.
Your brain has not fully developed and you're already experiencing paranoia, insomnia and anxiety! If you told an experienced drug user/abuser how often you take ecstasy and cocaine, they would say you don't have a problem, because for some that's not a lot. But you are not them and not everyone is honest enough to admit that they have problems because they take drugs.
You posted this thread because you're trying to find out more information, and that's great. But you're also a little concerned. That's good too.
When I discovered ecstasy, I loved it so much that part of me wished I hadn't discovered it because that feeling was, and still is, so great. Knowing how great it feels makes me want to go back to it. Same thing with meth. Then I did the research - the chemistry, the history, the experiences, the bullshit media spins, latest research, updates, positives, negatives. That was when I was 31! And I'm still learning.
I consume 10-20mg of pure uncut meth four or five days a week and have done so for 4 years.
Looking back, the one thing I'm glad about is the fact that I didn't discover drugs until I was 31. I'll be honest enough to admit that if I'd discovered it when I was 15 or 16, I wouldn't have had the strength to avoid bingeing. And that's where drugs probably do some damage. When it gets to that stage, the reason for taking them is lost.
Take something from everyone's opinion to your thread - they are all relevant and important pieces of advice. My advice is to you is to cut down your consumption of all drugs - smoking and alcohol included. You need to start functioning normally again. That means being stable emotionally and sleeping properly again.