Lung question need answers!?

so i went to health services the other day, i was normal in BP, heart rate, oxygen level, my lungs sounded clear. i did a nebulizer and it did clear my lungs a little but i'm now back to how i was feeling on saturday and i'm not sure what to do. should i have a chest x ray to see if my lungs are clear because they said they were not worried about it being anything bad. i also think i'm a bit of a hypochondriac. but now i'm coughing and it's kind of phlemy and i'm not short of breath only from exercise because of my asthma. i do have allergies and post nasal drip. does anyone have any recommendations on what to do? i've had bronchitis twice in the past so i know what it feels like. there also seems to be a heaviness on my chest, but not really heavy it's just a weird feeling i've gotten before but hasn't lasted this long.