My boyfriend has pain radiating down the left side of his neck to his chest. Full bloodwork showed nothing and while his heart went irregular in dr's office, heart monitor did not reveal anything as well as an ultrasound of neck and heart. The pain is so severe he has a hard time sleeping and is in constant pain. In addition, he has had pain in all of his joints for many years, with no medical help. This is effecting him severely and no one seems to have an answer. What type of doctor should he see?