Sounds like you are in a momentary pickle - no where to go but up - I hope.
You have been doing something for 20 years - Caregiving. I assume you were also a companion - chief cook and bottle-washer as they say.
And just because the person you cared for over those years is gone, there are many others that still need caregiving / companion services. In fact, in big demand at this time.
Indeed.com - Learn About Being a Caregiver
If you want . . . . you can take what you have done for 20-years, learn more about it - perfect your skills, get the training, certificate and find a job and start working on building your own new life. It would be a beginning . . . .
You could work for an agency or in an institution or even for an individual.
Read everything you can about it, everywhere - government (state) sites as well as individual companies and other resources - if you are interested. Make a plan.
Just a few that I pulled up that will give you more knowledge from both side of the equation - the beneficiary as well as the caregiver/companion. Individual state sites will be more specific of any requirements and licenses.
Aging.com - Find In-Home Care
Visiting Angels.com - Companion Care
Good Luck
It's Always Something . . . . Roseanna Roseannadanna