For the chills a hot bath might help. Sitting in a bath would be the only way I could get half way comfortable for 10 to 15 mins, and it would help with the muscle aches too.
Anxiety and lack of sleep were killers for me too. For lack of sleep I eventually came to a point of acceptance. Instead of lying in bed trying to go to sleep as hard as I could I accepted that I was going to be up for as long as it took. In a sense, I stopped fighting it and tried to do things to occupy the time at night. For me the best thing was watching old music videos on youtube. They were great because I could veg out, and they were distractions. There were even moments at night when I would have waves of nostalgia for my pre-drug life.
NA is a great resource, and I wouldn't have made it through the withdrawal if it wasn't for NA. If you haven't been before I would say that it is worth checking out.