Bit of background. I am 27 yr old female, with a history of minor asthma and allergies. Rarely have to use blue inhaler. At the end of the summer I got a very minor cold- it didn't even really turn into anything, but since then I have been having some scary breathing symptoms, mostly a nagging, intermittent sharp pain in my lungs that comes and goes, and has no pattern apart from disappearing at night. Within 1 hour of waking up I seem to get full of mucus which I then spend the rest of the day clearing along with a pain, which is mild (not taking anything for it) but nagging and persistent enough that it's worrying me. It's not the kind of raw pain that you get from coughing too much and irritating your lungs, but one that seems to have no rhyme or reason to it and seems mostly to happen if I am sat upright (which is most of the time, since I have a desk job) or stand up very quickly.
Please please please can someone tell me what this is? The anxiety is making it impossible for me to concentrate at work and all I see on the internet is 'Lung cancer'.