Problems logging in

Hi,
my blog was recently hacked and I had my host to restore it to a date where I knew it was OK.

Problem is now that I cannot log in to my blog.

I have tried changing my password with the “lost password feature” where I usually log in but I only get the error message “ERROR: Invalid username or e-mail” when using the username. When using full email I get the following “The e-mail could not be sent.
Possible reason: your host may have disabled the mail() function…”

I have also tried the emergency PHP script. Using my user (which is admin) it doesn’t work. Using ‘admin’ the script returns a positive response but I can not use it to log in.

So far I have not tried phpMyAdmin yet, still waiting to retrieve password from my host…

BUT, the strange thing is, I’m using TwitterTools to post blogs when liking, e.g a YouTube video and that still works! I’m using my own standard log in for that plugin.

Can someone please explain and provide a solution why I can’t log in but the plugin is able to update the site?