Question Author
Thankyou for your good wishes and suggestions.
The 'pneumonia' seems to have improved but his oxygen levels are still fluctuating.
He was very chatty yesterday but a bit worried. He's having trouble distinguishing fact from ficton. On Sunday night, one of the doctors looked like Kris Marshall (the actor) and having decided that, he then believed that he must be part of a TV show being filmed as there would be no other reason for Kris Marshall being there.....which makes sense in a strange sort of way.
He's also still on heavy Anti-Bs, was seen by the Occupational Therapists who declared him fit and mobile and the Optical Team who tested his eyes and declared him reasonably sighted (given they carried out the tests whilst he wasn't wearing his glasses).
He's on a wearable heart monitor and has to keep a diary of movements, etc. to match up with the results. The medics 'think' it is something to do with how his heart/brain reacts to stress.
I haven't been to see him today but expect to get an update from my Mum. Hopefully, we may have some sort of diagnosis....