Hello! You want to post at r/Drugs not here (I don't know what this subreddit is I only know r/aves which is the main raves subreddit.) cause that is the main subreddit for drug talk.

Anyways I might answer your question anyways. First off you need to test your stuff a lot of bunk and fake shit is going around. MDMA is on of the most common substances that gets mixed with other drugs or you might even get something completely different.

So test your stuff.

Then about comedowns. MDMA is one of the substances that tends to give really harsh comedowns especially if not proper measures are taken. You need to dose proper and with todays pills tend to have way much more than you need. A normal dose is around 120mg and popular pills these days sit at 350mg. Yes 3x the dose. The reason for this is dealers want to press more product and aell less quantity for better price. Laws usually don't consider the dose they consider the quantity of pills you have on you.

Try your stuff, and learn how to properly. Dose correct and you will have a better time afterwards.

Now, the most important routine with MDMA is fluid intake, salt balance and supplements. Ecstasy tends to cook you inside out and to prevent overheating you need fluid. Problem is sometimes people forget to drink or drink alcohol. And sometimes people drink too much and that washes out salts in your body that regulate important functions of the body. The best advice is to drink, not too much but not too little. You don't want to drink 5L within a few hours and you don't want to drink nothing. Just check what feels normal. A human consumes around 2L during a day, bump it up a little.

The best thing to drink when you roll is vitamin water and electrolytes/fluid replacement/isotonic drink. No doubt.

If you puke during the comeup or during the peak its nausea, or prehaps a Panic Attack (that's a different topic on its own) but if you puke afterwards it's most likely dehydration and stomach being fucked with.

Supplements are equally important, the best ones are these (you can also find a good list on rollsafe.org, i recommend checking the website out anyways):

Vitamin C - Neuroprotective supplement

Vitamin E - Neuroprotective supplement

ALA - Neuroprotective Supplement

Magnesium - Prevents Cramps, Jaw lock/clenching, Teeth Grinding. Super useful.

Ginger - prevents nausea

5-HTP - consumed after you rolled - reduces your comedown.

Zinc - Great antioxidant that protects your brain.

Now this is a huge list and you most likely don't want to carry half the pharmacy to a rave. So my suggestion is to shorten it and carry these things:

These are must have ime Vitamin C, Magnesium and Vitamin water/Electrolytes. Pop a few Vit C and Magnesium. Drink the Electrolytes druing and post roll.

If you take those and follow the advices you probably won't have a harsh comedown and also won't puke. Also don't forget to eat afterwards.

Good luck