Fortunately I've never tried any of the heavier drugs so I have no desire to try them. You've experienced the good effects of these drugs and it's normal for the body to want more of those good feelings.

Keeping busy with other things may help, such as exercise, working, volunteering, etc. I personally find marijuana very relaxing and helps with anxiety - we all have our vices. Maybe try to think of something that can replace the ecstasy cravings. What do you enjoy doing?