I assume i’ll get another error when i post this, it seems anytime i submit something its going to the error screen, a post, a name for PMing, edit, a spam click, etc.
Had to run a quick mySQL repair command on two tables, which had one-off table indexes. It apparently is nothing out of the ordinary for a mySQL system, because there’s a built-in command for repairing the error. And there are also Drupal pages about how to fix the error.
FYI, pages were really slow to load about 5-10 minutes before I started seeing those errors when I posted, so it looks like something was going downhill for a short while before it got into real trouble.