Need help

my husband has 6 stents, and in 2007 had a 3 way bypass. He still has pain. He takes pain pills. he has pain patches. none of these seem to work. I see him suffering everyday. I have no clue has what to do. He goes to the cardiology every 3 months. He takes plavix. He took ranexa, but it didn't work. He has symtoms of a heart attack alot. Doesn't seem like they can find out whats wrong. One doctor thought it was a muscle problem. Had test, not muscle problem. I wonder if it could be the stents causing the problem. The have been up in this heart about 25 or more times. Can a cardiology give me some advice on what to do?