I am a 66 year old female, 5ft tall, small boned. My normal weight was around 47.6 (7 and a half stones). However I've been feeling disorientated since April, which has now been diagnosed as Aortic Stenosis, and over the months I have lost about half a stone (I currently weigh 44.3kg). I'm worried that I may be classed as underweight and not able to have surgery. I do try to eat a sensible diet, but can't put back any weight. Any helpful suggestions would be appreciated. Thank you.