Your problem, then, is believing that the pill contains something you can never generate without it.

This is a false belief.

You absolutely can, and should, make the conscious decision to be more like X in your everyday life, where X is how you behave under the influence of MDMA.

I had the same problem, and got a horrible down when the drug wore off, UNTIL I realized that what the pill actually does, is SHOW ME WHAT I'M CAPABLE OF FEELING. The very INSTANT I believed it was possible, all bad feels disappeared and I was left with an afterglow that lasted for weeks.

It's not a downside of MDMA, quite the opposite; a reflection of your own weakness, the knowledge of which helps you fix it!