Help needed… sql errors everywhere

Yesterday it was working. Today I go to my site and everything’s broken. The posts won’t show, I get lovely SQL errors displayed on my site, the admin doesn’t display my posts so I can edit them, more sql errors.

I didn’t change anything until I upgraded, hoping that would fix things… but it didn’t.

the site’s at waitcomeback.com/wordpress.
Can anyone help?

the full text of the error:

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WordPress database error: [Got error 28 from table handler]
SELECT * FROM wp_posts WHERE 1=1 AND (post_status = “publish” OR post_author = 1 AND post_status != ‘draft’ AND post_status != ‘static’) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 15

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