My father has hypertrophic cardiomyopathy and just had his...

My father has hypertrophic cardiomyopathy and just had his thyroid removed. He was taking metoprolol to try and reduce the size of the heart. Most recently, like two weeks ago, he was taken off this medication to begin a new one and to date has been suffering indigestion, racing heart, he bends over and feels dizzy, shortness of breath, can hardly walk and feels full no matter what he eats. It can be the tiniest amount of food like a dry toast for example - what is going on? Also what would you suggest is aggressive treatment because I truly am questioning if medication alone qualifies????????