hi, for last few days i feel really short of breath, its strange, my chest just feels strange, its as if i cant get a breath, i have been to docs and he said my chest is fine and no tenderness or nothing. I have asthma and he thinks maybe its that. its awful because its constantly there, i have packed in smoking a week ago and im scared its a lung tumor or something that will be there all the time like emphsemia. what if the doctor missed something, im in a mess cos its all i can think about, i just want ti to go away, ive resorted to taking coedine to see if that relaxes me, i cant go on like this, i have a lil girl nearly 2, what type of mother am i if i just think im dying everday and its cancer. i just want to breathe normal and i dont want to keep pestering my doctor, please any advice ?