Severe Sciatica

My son has had to deal with sciatica for over two years now. This entire time, he hasn't gotten a single second of relief; the pain is ever constant. What's worse, it continues to get more severe. He's gone through six months of chiropractic care, gone through four months of aquatic rehab and physical therapy, taken numerous pain medications and muscle relaxants, yet NOTHING seems to give him even the slightest bit of relief. Unfortunately, his pain has gotten so severe that he's to the point where he can barely stand or sit anymore without cying out in pain and immidiately falling to the floor.

It seems the only thing that ever gives him the slightest bit of comfort is to lie on his stomach. But that seems to be a very unhealthy way of living; lying on your stomach for the rest of your life. He doesn't seem to be enjoying it much either. He's constantly twitching and spasming in pain, tears are constantly in his eyes, he's unabe to stand or sit for more than a minute without having to lie back on his stomach due to the pain becoming "too severe". He's lost so much sleep his eyes are sunken and bloodshot and his health has started failing in addition to all of this.

For the umpteenth time, I've taken him to the doctor for consultation about having surgery. However, my son chickens out at the last minute each and every time. In his own words, he's "terrified beyond all reason" of getting surgery. I can't force him to go through with it, and he's a very stubborn person. I seriously doubt that he's going to go through with surgery despite how much he's suffering. I've tried many times to get him to go through with it, yet he won't. (he's also refused having an injection, since the doctor seemed against it, being only a temporary solution and al)

So, this brings me to why I'm here. Is there anything, anything at all that can be done to releive his pain even the slightest bit? Any sort of special excercises he can try doing or anything he can do to help heal the inflammation of the disk? I can't stand to see him suffer any longer, and I'm afraid something very serious could happen to him if something isn't done soon. Please, I'm at my wit's end.