Goodness there is good and sadness within your post. I'm sorry to read of your loss. Please accept my heartfelt condolences.
You are a good advocate for getting up and dusting yourself down and off to Fernwood. BMI is a measure that I would've failed. I thought it would be more about full bloods showing good functions and if there is underlying conditions like heart and lungs etc but then again that is their medical opinion that they want a healthy BMI.
Wishing you well as you go through treatment. Take care Christine xx