Accidental redirect of site.

Hey WordPress peeps,

I accidentally made a mistake that I am afraid cannot be undone. If someone can help me, I’d be happy to throw a few bucks into a PayPal account for your time.
Essentially, my blog https://www.chunkysundae.com , is now redirecting to strangebeauty.com based on fault entirely of my own. Under settings, I was messing around late the other night and changed the URL to strangebeauty.com without checking to see if it already existed as another platform.
Under https://www.chunkysundae.com/wp-admin, I am not longer able to log-in as it redirects to strangebeauty.com, and under https://www.chunkysunde.com/wp-login.php, at the log in, it redirects to strangebeauty.com. You’ll see the formatting is messed up.
I don’t have the access to the original download and files of the manual edit of my site, as someone else set it up. I contacted him, and he said he doesn’t know what to do with this case scenario, and isn’t sure how to manually edit the files he has.
Is there a way to fix this, or am I SOL?
If there isn’t a way to remedy the situation, can my blog be deleted in its entirety?
Anybody willing to be help would be sincerely appreciated.
Thanks,

K