The shoulder is improving slowly, I can now lift fairly heavy things without pain, still not reached full range of motion.
Teeth have been fine, no more issues there.

Of the 3 internal issues that were being looked at, it's possible that only 1 of them is the source.
So far avoiding probable triggers has led to no more pain episodes.
But awaiting to hear about what is to be done with the source issue.

And looking into these has shown up another problem from blood tests, but that can be managed with a diet change for now. Maybe pills later.
This should also prevent the above issue getting worse.

I am now 6 weeks post-op. All seems to have gone well.

How did we get here?
Following on from the last update; I was still waiting to find out what exactly was wrong.

It was found that gallstones were causing issues.
Avoiding triggers was working well, until ~8 weeks ago.
I spent a week in increasing pain, especially after eating. And on top of that, no stools that week.
Went into A+E on the Friday.
They eventually concluded it had escalated to Pancreatitis (which can paralyze your intestines) and I was admitted to a ward.
Where I waited for an operation.
In the mean time I had my first CT and MRI scans.
Otherwise I spent the week in bed, either in pain or on good painkillers.
Rarely moving, not eating (as it caused stomach pain), and still no stools.
Was passed over for an operation twice but the offending gallbladder was finally removed and I was out the next day.
With the help of laxitives I eventually deposited something after 13 days.

Since then, no pains.
But I lost a lot of my muscle mass (not moving or eating for a week can do that).
So been slowing building up to my previous walking routine, almost back to normal this week.
And now I'm allowed to lift heavy things I can start my weight lifting again.