localhost- changed name, now cannot access my site

I accidentally changed my local host name under the ‘General’ section and when I went back to try and change it, it kicked me out and wouldn’t recognize my log-in. Now I cannot log back in or get on my original localhost server. When I go to my localhost name, it takes me to a non-live version of my website.

If I try and log in to wordpress on this ‘new’ server, it doesn’t recognize my username, if i try and connect to my localhost original server- I don’t have the option to log in, it only goes to that non-live version of my site. I am not super computer savvy, but can usually manage if I have instructions.

Does this make sense and does anyone know how I can fix it and restore my original wordpress server so I can continue to edit and build my site?

Many thanks in advance