You can change your website password or email address through cpanel. You can even delete any plugin through cpanel.
I have similar problem as you and I was panic for awhile. I deleted PMP plugin through cpanel but I still cannot login, so I changed my admin email adsress through cpanel and reset my password from my website login. Finally, I can login to my website again.
I’m not sure what had happened, but my panic disappeared once I know the method to gain access to my website.
