Password suddenly doesn’t work!

Everything was working okay, I had had WordPress up and running for a few months, and then one day, I went to the page and it sent me to the login page, instead! So, I tried to login, but it kept saying that my username/password was incorrect.

Finally, after trying everything I could think of, I clicked on the “Lost Password” option and was sent a new password, except the area that said “Login:” was blank, with no username after it, but it did send a new password.

However, this does not work either! I can’t seem to log in! Any suggestions on how to fix this?