I want to continue enjoying my caregiving experience

I am a 66 year old woman caring for my 90 year old mother, who is quite amazing - lives around ten minutes away by car in her own flat.  She is getting much more disabled, with dreadful back pain and registered partially sighted with macular degeneration.

We are very close but as she has become much more needy, very very dependent, my health has suffered - this is a lot to do with the fact that my husband died very suddenly just over three years ago, he used to support me so much with her. 

The doctor has told me that I am very high risk of a heart attack or stroke as I have not been careful enough of my own health, with blood pressure and diabetes, not keeping track of things properly.  I am also in the process of handing my business over.   It is just sooooooooo hard and I get massively exhausted.  I think part of this maybe because perhaps I care for her too much, my husband died so suddenly and at that time I was not able to be there for him when he actually died, it was so quick and he was in the other room.  I wasnt able to say goodbye - I try to make every day count now, with my mother, and want to make the most of the rest of our time together.

Just so tired.........thats all....optimistic personality though on the whole....just not coping very well right now.....