No...I don't know where the spinal cord thing came from.

MDMA works on the seratonin receptors in the brain, and the only thing that MIGHT mess with the spinal cord at all would have to be something that they are mixed with. In most cases nothing worse than speed (and generally the legal stuff like Ephedrine or Caffeine).

The whole "Hallucinogens make your spine bleed/drip blood/constrict/whatever" is a myth as well. Most of these chemicals once again work on the seratonin receptors within the brain.

I would highly recommend checking out www.erowid.com for some really good, accurate research data.

However I will say this.

Bulk up on 5HTP. This is the precursor to seratonin for the body, and if you start loading your body with doses of 5HTP a couple days before the ecstacy dose, and for a couple days following, it will heighten the effect of the MDMA and it will lessen the depression afterward. Also the better you keep yourself hydrated throughout the experience and while you are coming down, the better you'll feel the day after. Most of the crappy feeling (non emotional) you get after rolling is due to stress on the muscles (which stretching can help with before and after) and from dehydration.

One of the only other dangers that people have experienced in the past with MDMA use is that over overheating and overhydration. If you're going to be doing this in a private situation where you have a good control on the environment you are in, then the first problem should not arise. The overhydration issue might be something to keep in the back of your head though. What happens if you drink TOO much water, is that the body starts expelling too many necessary minerals, and you end up with a potassium deficiency. Potassium is necessary for the cells in the body to transport materials into and out of the cells...and lacking this can cause multiple problems. Just so long as you're not drinking a gallon of water through the experience, you should be fine.

Another thing you might want to try doing, is take a teaspoon of Milk of Magnesia when you dose. The magnesium helps fight the jaw-clenching, and the antacid effect stops stomach acids from destroying the MDMA before it is absorbed into your bloodstream. You know...more bang for your buck =P.

The final thing I suggest...there is a non-prescription medication called Piracetam that SERIOUSLY enhances the effects of MDMA...as well as almost ANY psychoactive substance. Piracetam is a neurotropic that increases brain activity and increases bloodflow to the brain. Taken on a regular basis as a supplement, Piracetam just helps you stay more focused and clearheaded. With MDMA...it does wonders. =) Piracetam can only be purchased online.

Have fun!