I’m attempting to log into my account (Jynx0) with the same password that I’ve always used, which worked just a few hours before. I copy and paste it every time and it works every time. However, I received an error saying it was wrong. Please help me I forgot to add an email.

That's literally warned about in the TOS. If you forget your password and don't have a recovery email set, you're SOL.

Ooof.

I didn’t forget it. It has to be an error since the password has not been modified in any sort of way.

Maybe try clearing your cache. Disconnect from any VPNs. Reboot your PC and try again. Wish you the best of luck, I would add an email if you're able to get in.