Always gotta say this when someone's been rolling and I don't know if they've been told yet ...
Anna, don't roll more than once a month. It's an easy rule to break, I know, and it sometimes seems like a silly rule to people who haven't broken it enough to know, but seriously, it's also a really easy rule to stick to if you want to, and you really should, because it really helps.
If I'm repeating someone else already told you, then good, that means your friends are looking out for you. If you already knew this just because you looked it up, that's fantastic. If I'm the first person to mention it, then take it from someone who both uses MDMA on a regular basis (about every 6-8 weeks at this point), and did a term paper on the neurotoxicity of the substance. Don't do it more than once every 4 weeks, and leave 6 in between optimally.