Should i call my doctor?

when i try to inhale deeply my chest hurts a little bit and once in a while i take a small coughing fit for no reason i try to bring up phlegm that i feel is there but can't bring anything up...it hurts worse in the morning and then as the day goes on it gets better and most days i don't even feel it after the morning but today it feel it all day i had a sickness like this last christmas which i thought was pneumonia i didn't call my doctor then i just treated with rest and mucinex md could this be happening again or is it allergies? should i call my doctor or just treat it the same as i did last time?