Do you have server level access? If so, then the best bet would be to try and repair directly from the MySQL prompt.
If you can't reach the site, the repair you ran through threads might still be running. If you have direct access, then you can check if it's still running by typing in "show processlist" from the mysql command prompt.
What version of MySQL are you running? There are several versions of MySQL that are more prone to corruption, in their release notes they do mention a few versions that were updated for this reason, so a MySQL upgrade might be in order.
