Hello dear, thanks for your question on HCM. 
I can understand your situation and problem. 
In my opinion you are having mostly anxiety related symptoms. 
But better to rule out cardiac cause first. 
So get done ecg. If ecg is normal then no need to worry much for cardiac cause. 
Anxiety must be the cause for your symptoms. 
Anxiety can cause GERD ( 
gastroesophageal reflux disease ).  And your central 
abdominal pain after eating is mostly due to GERD.  So control of anxiety should be done to relieve all your symptoms. 
Better to 
consult psychiatrist and get done 
counselling sessions, try to identify stressor in your life and start working on its solution. 
You may need anxiolytic drugs too. 
Avoid stress and tension, be relax and calm. 
For GERD,Start 
Proton pump inhibitors  and avoid hot and spicy food. 
Don't worry, you will be alright.