Thanks for your question on HCM.
I can understand your situation and problem.
In my opinion you are having blunt
chest trauma. And pain on coughing,
sneezing is seen in following possible complications of blunt chest trauma.
1. Rib fracture
2. Pulmonary contusions
3. Pneumothorax
4. Muscular
injury.
So get done chest
x ray. If chest x ray is normal then no need to worry much.
You are having muscular injury mostly.
So try to follow these steps for better symptomatic relief.
1. Avoid heavyweight lifting.
2. Avoid strenuous exercise.
3. Avoid bad posture and movements causing pain.
4. Start painkiller and
muscle relaxant.
5. Apply warm water pad on affected site.
6. Start antihistamine drug for cough and sneezing.
Don't worry, you will be alright.