Interesting topic, but not suitable for OD so I'm going to move it to DC.
Anyway, for me, opiate withdrawal makes me incredibly emotional and like the above poster said, I have weird sensations of impending doom. Everything becomes disgusting smelling, looking, and feeling. When I was living on the streets it was incredibly horrible, because the reality of my use would come crashing down on me, and it would be almost unbearable. I remember one time my girlfriend and I kept having trouble getting fly spots (panhandling spots by off ramps/on mediums in case you don't know), and it took us all day to make just $20 (which was enough for like, half a shot), and when we finally got the money together the dealer had us meet in the parking lot of taco bell. Of course, he was super late, and by the time he got there, there were about 50 junkies just hanging out, but my friend offered me some weed to help with my withdrawals because my eyes and nose was running so bad. I took him up on it even though weed makes me paranoid, because I thought that I couldn't feel any worse then I already did. Well boy was I wrong. To make matters worse, immediately after doing my pathetic dime bag shot, I decided it would be a great idea to take a hit of crack. Afterwards I literally felt like I was in hell, I ran back to my little tent and just laid there in agony until I again became so dope sick I couldn't stand it and went to panhandle again.