With the normal x-rays and blood work, your pain is almost certainly due to a muscle problem. It reflects muscle or ligament strain or a rib fracture.
Maddy here if you find out what this is let me know
I've been trying to think that too but my doctor says no, though it does feel like it.
it sounds like you probably pulled your chest muscles with the bad cough...that may take time to resolve.
I have the exact same chest pain that maddy77 is having. It is always on the left side, and if i lift up my left arm, the pain becomes more intense. It feels like I have a big bubble in my chest/ lungs that needs to be popped, but if i take a deep breath to try and pop it, it hurts so bad. it gets to the point that i become scared to breathe. i have asthma, but i doubt it's a symptom of that. if there is anyone that is expirencing the same syptoms, please let all of us know. thanks