Post Acute Withdrawal Syndrome.
Or progressive animal welfare society, but hey that's a different forum.:)
PAWS look in GreatGreebo 's journals. Parts 1, 2, & 3. Here it is.
http://www.medhelp.org/user_profiles/show/333612
I wonder is PAWS might just be from our bodies detoxing. After we have quit using the drugs for awhile, our bodies get a chance to start cleaning house, because they're not busy processing the drugs anymore. When all this stuff is stirred up and cleaned out of our systems, we feel pretty crappy.
Just a thought.
I do think that is a part of it. Also, the drug use changes your brain chemistry. Maybe for good. For some PAWS lasts for many, many years!