Sooner, you are so strong and capable too; we will help to reassure you - we've got that part! You are doing what feels right for you! If you have any doubts at all about selling your current home, would it be an option for you to lease your home for 6-12 months? If you could swing that (with monthly rental payments), maybe you will find some comfort in the fact that you could still change your mind.
When I first found out about Dave's illness, I spent hours driving all over looking at houses for sale. We live in a remote, "country" location, and in the Winter, it can be very tough - even for someone younger and healthier. The property in entirety takes a LOT of work. So, I was absolutely panicked about caring for this property alone; thankfully a few neighbors have stepped up & have been tremendously helpful. I could not imagine taking Dave away from the place that he has nurtured and loved for 35 years. And, after Dave is gone, IDK if I will be able to leave for a long while. While there will be reminders of all the sadness and losses that have occurred here, there will always be so many good memories here as well.
Ironically, as I write this I have an episode of "The Middle" playing in the background. The oldest son (Axel) is asking his dad for advice in making a major decision. The dad says ....."I'll tell you the best advice my father ever gave me .......... you'll know when you know; you should do what's right for you" You've got this Sooner! BIG HUG!