Database Error – Lost all my posts – help!

I just published a post and lost all the posts on my blog. This is the erroe message I got back. Can anyone help me understand what’s happened and what I should do?

WordPress database error: [Got error 28 from table handler]
SELECT * FROM wp_posts WHERE 1=1 AND (post_status = “publish” OR post_author = 2 AND post_status != ‘draft’ AND post_status != ‘static’) AND post_status != “attachment” GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 15, 15