If you have managed hosting, get a ticket in with the server admins to configure a firewall, and to troubleshoot what's going on.
5 captchas... a bit of an overkill - if they can solve one, why not the other? There is technology that can read your facial expression and determine if you're sad or worried. There's really not much reliability in captchas these days except maybe stopping bored amateurs. At that, it almost sounds like some hacker school is practicing bot-captcha-solving on your blog.
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