Darling, if treating an addiction (psychological or physical) were as easy as coming on a forum and someone telling you a step by step guide from strangers, there would certainly be pretty much no addicted people in the US.
You can either stop, cold turkey, because you recognize that it's an issue, which works perfectly well for some people, or you can get a workbook on addiction in a book store and start working through some of your issues independently and learn about addictions and how they work, or you can get set up with a drug and alcohol counselor. An addiction to MDMA is just like any other addiction and should be treated as such.
I'm personally a fan of reading about addiction (Realm of the Hungry Ghosts is an amazing book) and doing independent work through workbooks (there are many, go on Amazon or to a bookstore), it can be very helpful for people who are just starting out and who can't afford a counselor! But if there's any way at all that you can afford one, or secure some funding for one, there will be 1 million and one things they can teach you that random peeps on the internet can't!
Treat this like a typical addiction and start doing your research, friends- there's a lot out there on the internet nowadays that's high-quality! Good luck, I hope you can get a handle on it- the first step is admitting there's a problem, so you're one step down