Severe right shoulder, arm and hand pain.

Recently I had been getting a stiff neck, which is quite usual with me. I am an anxious person and it always seems to manifest itself in my neck and shoulders. About 2 weeks ago, I went to Chiropractor and had a deep tissue massage as my shoulder felt knotty. The next day I felt like I had been in a boxing match, but put that down to the deep tissue massage. The chiropractor and masseuse both said that my shoulder were like rock and the pain I was feeling was due to spasming muscles in my shoulder. After two days, the pain was like nothing I have ever felt before. No tablets, warmth, or cold would shift it. I called doctor at 4am because I was ready to jump off the nearest bridge, but he said there was nothing he could do. Went to doctor next day and he gave me diazapam. This didnt work either. I am taking co-codamol, ibuprofen and diazapam and feel like a zombie, but still the severe pain is there. The pain is in my shoulder blade, the top of my right shoulder, down my arm and into my hand. A lot of the time its the hand pain that is worst, it throbs really bad. I dont sleep for more than a couple of hours. I am at my wits end. I live alone and I am self employed so I have to work, which is computer based, so I guess that isnt helping. I cry a lot, but because i haven't got my arm in a sling, no-one seems bothered, they just say, 'just work through it'. My mental state is all over the place due to the constant pain, I just cant bear it anymore. Does anyone else have any similar problems or advice, I am desperate.