My nephew was at work, had pain in chest, went to ER. they admitted him, said he has a mass on his heart. Was in ICU for dew days. Drs said they don t know what caused mass, but said he was using left arm to much at work, he s a cook. They sent him home, still same symtoms, still pain in chest. What should he do. Please answer soon. I know this is dangerous. thank you carol