Thanks for your question on HCM.
In my opinion you are having anxiety and related symptoms mostly.
But since you are getting chest congestion and foamy sputum in night after lying down, we need to rule out cardiac failure first.
Your symptoms are typical of
orthopnea and orthopnea is seen commonly in
heart failure.
So get done 2d echo. If 2d echo is normal then no need to worry much for cardiac issue.
Anxiety seems more relevant cause in your case.
Anxiety is one of the most influencing factor for
acid reflux. So control of anxiety isust in your case.
So
consult psychiatrist and get done
counselling sessions. Try to identify stressor in your life and start working on its solution.
Avoid stress and tension.
Be relax and calm. Don't worry, you will be alright.