I have a weird pain on my left side, sort of a stabbing pain, that occurs maybe twice/three times a day. It sort of feels like my lung is catching on something sharp, and whenever it happens, I find it hard to breathe and I have to take a very deep breath to uncatch it, if you get my meaning. After that its fine and doesn t hurt but it keeps happening. Do you think it s serious? Should I go to my GP?