I just – I think – found the solution to my problem. Well, there is another problem yet to fix, but I can see my homepage!
In setting – reading, do you have the same front page displays? Check it out, I had the same and I made the them different and now I can see my old home page!
As to going back to the older version… Hmm… I know WP saves our older versions of pages. Who is your webhost? Can you call and ask to back in your logs and reactivate an older version of WP?
Good luck, I know how frustrating this is. I am far from a technical person but I wanted to at least give you the info I found. Oh, and someone else posted that idea, it was kiwi something or other. I didn’t come up wtih it on my own. ??