Here is information on PAWS....perhaps you are unaware
http://www.tlctx.com/ar_pages/paw_part1.htm
I think the fact he is taking 2 drugs
pain med + Xanax
also have a part in this situation.
As you can see...there is no definate time line.
By day 4 my physical symptoms were finished.
I was not using any drug..my health was good.
Blessings