What type of doctor can help with chronic pain?

My husband has severe back and hip pain. He is walking with a limp and his back is very painful. His orthopedic doctor had tried injections of cortisone into his spine twice over a 1 1/2 year time period. This treatment was somewhat successful. However, during the past year he had to have a stint placed in one of the heart arteries and is now on Plavix. So he has been told he can not have the cortisone treatments anymore. He also is a diabetic and had by-pass surgery about 8 years ago. He suffers from high blood pressure and is on meds for that also.

My questions are: 1. Is there anything that can be done for his chronic back and hip pain?? His cardiologist has told him he definitely cannot have surgery. He did not want him to even have a tooth extracted that was a problem.

2.And also, what kind of specialist should he see for his chronic hip and back pain?

3.He has only taken over the counter arthritis pain medication. Is there a stronger or better pain medication that you can recommend?