What you do is you get out your mobile phone, and sms every ex-girlfriend/boyfriend and tell them you still love them and you're sorry for everything, also while you're at it message a few distant friends and tell them you still love them and you're sorry you haven't contacted them more often... then phone your mum (it doesn't matter what time) and tell her you love her. Don't worry about the sleepy confused reply, she loves you too.
Then go hunt down numbers of people you know overseas. This is particularly good fun... don't worry about the phone bill. Ramble to them while they're at work during the day - they'll adore your conversation! This takes up a good few hours.
Then get out some photo albums and have a nostalgic moment.
After that, make some toast, put on a dvd...
Decide you don't want toast, stop the dvd, get out a writing pad and write some profound poetry. Ponder yourself and the universe. Go kiss/hug in their sleep, whoever is sleeping and missing out on your mdma-goodness.
If you have a cat, now's a good time to have some fun with the cat. Cats are great for mdma- leftover luvvin. Failing all that, have a shower or a bath.... it feels really good. Listen to music others hate but you don't. Smoke a cone. Try to drink Milo.
Oh and : POST ON BLUELIGHT!!
half of this was joking ( i gather you know which) and it morphed into real advice, but believe me: I've been there and done all of these things.