Try pre-loading 5-HTP - the more pure the pill, the easier the come down....Make sure you stay hydrated and don't overdose yourself in a sad attempt to lengthen your trip....that's what causes a lot of the problems the next day, simply overdosing.
Also, start as early as possible, the more rest you get the better you'll feel the next day (I have found this makes a HUGE difference)....
Ususally bad come-downs, speedy effects, and a really bad "hang-over" are signs that you had MDA not MDNA...
enjoy...........