Welcome to HCM
We understnd your concerns
You can suspect that it is acidity in the wke of the symptoms you mentioned. Acidity or reflux disease often has fullness of sternum
, lower chest, stomach area, diaphragm etc. The fullness can be anywhere in these areas.
Also you took the right decision to consult your doctor because they are your correct judge. But nothing to worry. Try garlic along with food and you will get relief.
Get well soon.