hi. You do not say how old you are. Or if you have ever skipped before. It's not unusual that in times of stress
to skip the menses. During finals women often skip periods because of pulling all nighters. Shiftworker's also have this problem. The natural cycle can be disrupted. I am sorry that you had a bad experience with depression
. People who are depression, as your found out, often have a worse time with PMS and also don't tolerate the after effects of mood altering substances including legal ones like alcohol.
I do not think it is the MDMA itself but the fact that you are so stressed about it which may be contributing to your skipped or late cycle. If it persists in being irregular it will be time to see the doctor and have your thyroid
function and prolactin
levels checked by simple blood tests. Otherwise I wouldn't worry too much about it and as your life normalizes so should your cycle. Feel better soon.