DONT swap e for speed.....its almost certianly going to increase ur problems. And remember, they are fairly similar anyway (well physically), so taking speed instead does not count as a full break.
As for a 1 month break - most ppl would consider once a month as heavy use, so....at LEAST a month if u can!
And yeah, the best remedy is getting active. Want drugs? Run /bike/swim/etc like a madman (u can spell mdma with madman!) and feel the endorphins rush hit u.
Not enuf? have some great sex!