That's an interesting story, op. You never tell us exactly what the psychedelic you took was, but there's really no way that any traditional compound could circumvent the withdrawal process.
You said that you did this on the second day, and if this was your first time, feeling fine after three days isn't all that strange. Also, you took a valium,which has a long half life and can help as well.
I'm Certain you had great benefit from your trip and hopefully it will help you stay away from opiates in the future.
Sine experientia nihil sufficienter sciri potest -Roger Bacon
*γνῶθι σεαυτόν*