hi one day i was walking and my heart started to speed up with every moment i made on the right side of my body around my middle lope i feel like a dent between my rib cage and i also feel like a lump right in the middle of my chest im having shortness of breath and when i blow my nose out comes mucus and blood and very dark bugors what can this be plus from time to time i feel a sharpness of pain shoots from the spot of my middle lope to my brain what symtoms are these lung cancer probably ive been to the hospital got a x-ray but they said theres nothing wrong