I ve been experiencing tightness in my chest with pain that goes in the left side of my back under the bone. I went to the ER and they did blood work, an EKG, a chest x-ray and sent me home with 600mg ibruprofen. That was a month ago. The pain has nt completely gone. If I take something it will ease a bit. Since yesterday I have been feeling the tightness again with the pain in my back, with nausea, constant burping and today slight numbness in my left arm. I think I should go to the ER again, what is your suggestion? Thank you.