I think I may have fixed the problem. I found a table that wouldn’t open properly and couldn’t even be repaired initially. I hit it with a big hammer and it’s now opening and allowing me to query it. The vital signs from the database process look a whole lot healthier now too which is a good sign.
I won’t be sure if the problem is fixed until the database has run for a while, so I’m hoping it’s still running in the morning. Ideally I’d like to see it survive >24 hours but I’ll live with 10 hours uptime from now which takes me to breakfast time tomorrow morning 
Fingers crossed!