Sudden Admin Login Error

Help!

After trying to login to my dashboard for the first time in a week, I keep getting this message after entering the username and password:

“ERROR: WordPress requires Cookies but your browser does not support them or they are blocked.”

I KNOW this isn’t the case, because I can successfully login to another, separate wordpress blog just fine. (AND because cookies are fully turned on, etc.)

What may have suddenly changed? Have I been hacked? Could it be a recent plugin I installed?

(One other strange, sudden thing…all my page now automatically direct to a “/blog/” subfolder version of that page. For example, https://www.iphone-extras.org automatically redirects to https://www.iphone-extras.org/blog, and https://www.iphone-extras.org/unlock-iphone automatically redirects to https://www.iphone-extras.org/blog/unlock-iphone…????)

I fear one of the sitemap plugins may have done something (Google XML Sitemap…and the other sitemap plugin). I’d like to deactivate them, but can’t get into my dashboard.

Please, please, please help!!

Thanks,

Mike