Greg, I HEAR YOU. Use drive coast to coast back in the 80's and early 90's and I had those same thoughts and fears about being homeless. I've already gone through being homeless once, about 10 years ago. I am faced with same scenario today just like you, again.
Only thing I can tell you is just take it one day at a time.
I remember the first time when I was faced with it. The "thing" that saved me, was saying "F**k it, let it all fall down. I'm powerless to control what happens here. So I'll go somewhere else." and it worked. I moved and rebuilt my life. It worked, well for awhile anyway.
Faced with the same thing all over again RIGHT NOW. I know what the answer is but this time as of this morning, I do not have the cash to leave.
So YOU hang on, accept that YOU have to live one day at a time right now.
You come across like you have strength, but that your overwhelmed. Reach inside and tell yourself that it's normal to fall down. It's OK that sometimes your life goes out of control. As long as your ALIVE, you always will have the ability to stand back up.
I'm not even supposed to be "here" at this date and time. Well that was the plan, but something other then FEAR has kept me here. I don't know what it is, but I think(and Hope) if I take it one day at a time, I may just find the answer.
If you need to talk, please msg me. Peace...