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 disease.
In my opinion, you are mostly having
stress induced GERD.
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 Central burning
chest pain.
So 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 the bed to prevent reflux disease.
7. Avoid
smoking, alcohol or caffeine if you have these habits.
8. Loose weight, if you are obese.
Don't worry, you will be alright.