Can't login anymore, username unknown and site offline

Hello,

I hope someone can help me out with the following problem:

I requested a new password because I haven’t logged in for a while in WordPress and simply forgot my password. After changing my password (received a mail and link etc.) WordPress gave the error that my username doesn’t exist. This is the same username I used to request a new password. After trying to request a new password is now shows also the message that my username doesn’t exist.

Since this username problem came up my website (www.monsieurchaigneau.com) seems also offline (?).

I really hope that someone can help me out, because I’m afraid everything seems lost.