Thanks for your question on HCM.
I can understand your situation and problem.
In my opinion you are having
musculoskeletal pain due to muscle pull and related
chest pain and difficulty in breathing.
But better to get done chest
x ray and PFT (pulmonary function test) to rule out lung causes.
If both are normal then no need to worry much.
You ate having musculoskeletal pain mostly.
So try to follow these steps for better symptomatic relief.
1. Avoid strenuous exercise.
2. Avoid heavyweight lifting.
3. Avoid bad postures in sleep and movements causing pain.
4. Start painkiller and
muscle relaxant.
5. Apply warm water pad on affected site.
Don't worry you will be alright.