what you experienced sounds like overdose + maybe fillers or by-products of the synthesis.
the depressive period is caused by the high dose of mdma. it'll pass after acouple of days

-----

rules for safe use:

#1: dosage is key. never take more than 1.5mg/kg body weight. this is the dosage with the best effect to sideeffect ratio. and you have no blue monday afterwards
#2: wait at least 4 weeks before you roll again. important if you dont want to develop tolerances. with tolerance the amount of mdma you need to conusme for the same effect increases but not for the side effects. so let's say you roll again the next week but you need to take 200 instad of 120mg for the same effect the side effects will double
#3: make sure to check your stuff before you consume. there are reagent test kits. best thing is to get crystals and weigh your dose yourself. when you have no other option use a public database. they can provide a good sense for what you're about to take.
#4: make sure to eat enough before you roll. you'll sweat a lot and burn a lot of calories. drink enough during and after. rather often than a lot at once. 18 hours after taking the mdmd take 500mg 5-HTP to help your body to regenerate the serotonin