I'm really worried because I've been having this pain on the left side of my chest for a few months now. I'm asthmatic but I'm not having any trouble breathing or coughing. I saw a heart doctor and he did an echo, which came back normal, and the chest X-ray was normal too. The pain is kind of between my lower ribs up to the upper side of my chest, and sometimes it goes to my back. I'm really scared about what it could be. Can you help me figure out what's going on?