My Boyfriend Is Experiencing A Tingiling Sensation In His Legs

My boyfriend is experiencing a tingiling sensation in his legs and left arm, a dull annoying pain in chest and shooting pains in his lower arm. He says they are not constant but frequent. Can not sleep from the discomfort. We went to the ER on Sunday and they did an EKG, chest xray and blood work. Said they did not see anything critical and sent us home without much further information. He seemed better yesterday, but all symptoms came back last night into the morning. Just looking for other possibilities.