There's deffinately something going on, I get this warning when I try to go on your website.
I'd start by securing EVERYTHING. Change every password and make it stronger and harder to crack. This includes your database, wp details, cpanel details. Contact your host, maybe they can help you with some of this stuff and maybe even provide some more info as to what's going on.
Try backing up your wp-content folder and installing Wordpress fresh, then add your old db and wp-content folder back in.