Thanks for your question on HCM.
I can understand your situation and problem.
Since your extensive cardiac work up is normal, no need to worry for cardiac cause.
Substernal chest soreness is mostly due to
GERD (
gastroesophageal reflux disease).
It is due to laxity of gastroesophageal sphincter.
Because of this, the acid of the stomach tends to come up in the
esophagus and cause the symptoms of burning pain or soreness in central chest.
So try to follow these steps for better symptomatic relief.
1. Avoid
stress and tension.
2. Avoid hot and spicy food.
3. Avoid large meals, instead take frequent small meals.
4. Start
proton pump inhibitors.
5. Go for walk after meals.
6. Keep 2-3 pillows under head in bed to prevent reflux.
Don't worry, you will be alright.