Question about Ecstasy

[anony]

SWIM did a bad thing last weekend and BINGED on ecstasy.
SWIM didn't have a harsh comedown the next day (sunday), just felt tired, but continued to drop 5 more on sunday night but he tells me there wasn't a real affect due to dead seretones(expected outcome).
The next day there wasn't any tiredness and swim went to work feeling fine. Throughout the day SWIM would be in random situations whilst standing up, and finds that he goes REALLY light headed, to the point where swim has to shake his head to wake up him\stop him from fainting.
Today, swim was in his mate's car and smelled his mate's air freshener up close (gentle sniff). Instantly swim went really light headed to the point of almost passing out.
This consistantly is happening but not often, tends to happen to swim when there is alot of lighting around too.
Could this be of the brain still recovering\being tired from the ecstasy consumption\dead serotones? Also I was telling a friend that studies the body at uni and he thinks it could be related to dehydration issues?
thx in advance