Shortness of breath. dry cough.

[Jhops]

I quit smoking about 5 months ago. my daily pulse is about 63 to 65. Before I go to bed, it drops to mid 50's. I get lots of dry coughs, like something is stuck in my lung or something. And most importantly i get shortness of breath like my lung is full of dust. About 10 times a day, I can feel my heart skips a beat and that makes me cough. I had EKG and heart stress test about 2 years ago, the doc said i'm ok. should I go check my heart one more time? I googled about my dry coughs and it said, it could be my lungs recovering from the past, cilia is recovering or something, i don't know, but it said it usually last for first few weeks after quitting smoking. My lungs feel worse now than I was smoking, as ironic as it sounds. Hard to take a deep breaths.. can anyone give me advice?