Shree, I am so so sorry at the events surrounding him.
I don't think there are any words I can give you for wisdom in this. All I can do is offer a virtual hug (((((((hugs))))) and the sending of love your way.
I know for me 51 I am worried as I have a whole host of health problems one being Meneires (vertigo).
I personally get scared sometimes when as I move on preparing myself to leave him.
The one thing I started to do was research for support groups for woman growing old alone.
I just started the research recently but I will share a link I found valuable enough to keep as they mention a few things in there.