Woooow, that's a shitload of MDMA. First of all, you might want to invest in
a testkit. There is no way you have high quality MDMA there, if you did a gram of that you'd most likely be in the hospital, at the very least you would have been completely overwhelmed and floored, to the point where people would rush you to the paramedics if you're at a party. That's about 8 times a normal recreational dose. You would have massive after-effects, not just some anxiety. Consider yourself lucky you either have low purity MDMA or you have something else other than MDMA there. If you ever run into high quality product and you dose like that you're going to get hurt. Have a read of
this thread for some pointers. Do some research into how MDMA works, it's not weed, it can really fuck you up if you misuse it. Please listen to this advice, I'm not saying this to criticize or belittle you, but what you're doing is dangerous, you might not know it, but it is, you're
going to hurt yourself one day if you carry on like that
As for the anxiety, apart from the common home remedies for anxiety (perhaps try some valerian root tea? The strong kind) there isn't much else you can do other than wait it out. It will pass, but your body needs time to recover. Abstain from drugs for a while, including alcohol, weed and caffeine, eat healthy and exercise a lot (that last one really works wonders, try it). Welcome to bluelight :D keep us updated on how you're doing. I'm going to add the (untested) prefix to your thread