My site and log-in has disappeared- tried to rename the site

I were building my website under the address https://test.adfoto.se and wanted to change it to https://adfoto.se. So I tried to change it under settings, but not the right way I soon understood. When I hit the save button the site disappeared.

Now I cant log-in. When I try it says: Not Found,?The requested URL /wp-login.php was not found on this server.

And when i visit the site I just see text without my theme or pictures: https://test.adfoto.se.

I had a different site before that I want to replace with my new wordpress site. That’s the one showing at adfoto.se and when you try to click at something at test.adfoto.se.

Any ideas how I can get in touch with my wordpress site?
Is this a problem you can’t fix, please says so and I will start build a new site…

Please help me!