Hi
Welcome to HCM ,
pain and weakness may be due to his PAD problem or due to low sodium level as
heart failure patient usually will be on
diuretic treatment means water pills ,
hoarseness of voice may due to heart failure as in heart failure as times goes on left atrium will start getting enlarge and it start pressing one
nerve which lies just below the left atrium and that nerve will control function of voice box muscle and pressure over that nerve will cause hoarseness of voice ,
consult your cardiologist and follow his advice ,
restrict salt intake of your mother ,
modify her diet inform of adopting healthy diet ,
she need to take proper rest ,
use two pillows while sleep ,
take care