Can't access my admin login page

Hi

This morning I could access admin but tonight any attempt to access the login page redirects back to the home page. I tried my saved links, manual url, via my ipad app .. I have made no changes in my plugins, apps or via ftp for a week. I did a post yesterday but have logged in since.

I did get an email from my host today saying an ip had been blocked from my admin due to too many attempts.
I also got a spam comment get through the Askimet gate waiting for moderation.

My host email said: A host, 91.224.160.35(you can check the host at http://ip-adress.com/ip_tracer/91.224.160.35) has been locked out of the WordPress site at http://www.dinagoebel.com until Monday, January 21st, 2013 at 10:35:11 am UTC due to too many login attempts. You may login to the site to manually release the lock if necessary.

Any ideas?
thanks