Welcome to the club no one wants to join. We're happy that you found us.
In truth, it is not likely that you are alone, despite your username. Most people have social contacts via some combination of work, friends, family, professionals, neighbors, organizations, churches and so on. If it helps, make a list of everyone you know who might want to help you in some way at some point. That list includes thousands of forum users here and elsewhere, and I'm sure ATL has scores of local support group members as well.
You will never stop being afraid of the future, so get the "what if" paperwork done, keep doing the things that fulfill you, let people know who need to know, and adjust to the physical changes as you must. That way, you are less likely to be afraid of the next five minutes, so you can spend on them something more useful and/or fun.
Best,
Laurie