Weight gain

Prior to starting CAMZYOS my regular cardiologist had me on a fairly high dose of metoprolol going from 25 mg to 50 mg finally to 100 mg a day and I gained 25 pounds… I was told it was because of less strain on my heart and slowing down also slowed down my metabolism. After camzyos 3 years ago they decreased my Metropol to 25 mg at night, but I have never lost any of the weight I gained. My HCM Center does not allow me to do any exercise that increases my heart rate so only cheer exercises and slow walking are allowed as well as diet or portion control none of which seem to work… I was fairly asymptomatic with the HOCM except for shortness of breath going upstairs. I also have asthma which exacerbates the shortness of breath at times not sure there is anything I can do about that weight gain but it is rather frustrating.