I Had A Neck Fusion In 06. They Said The

I had a neck fusion in 06. They said the one above it is dry now. I have been in extream pain. The muscle relaxer isn't working. It is stiff and hard to move. Also the past few weeks my knees have been causing me a lot of pain making it hard to move around. About a month ago I started getting a stabbing burning numb feeling in my right thigh. Two weeks ago I went to the er cuz I fainted. They said I had prolonged qt's. What is wrong with me?