Thanks for your question on HCM. 
I can understand your situation and problem. 
In my opinion you are having GERD (
gastroesophageal reflux disease) mostly. 
But better to get done ecg to rule out cardiac cause. 
If ecg is normal then it is mostly due to GERD. 
GERD 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 
chest pain and 
vomiting. 
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 the bed to prevent reflux. 
Don't worry, you will be alright.