Thanks @TheDrsWife46, @longshot, @onlinelinda, @stayathomegardener and anyone else I've missed. DH had his scan ok and we phoned the haematology department this evening to check when he'll get results and to report the episode of confusion (the only one so far). The nurse who we spoke to has emailed his consultant and another doctor he knows well and says they will look at the scan tomorrow and get back to us (the proper report will take longer). She said we can call 999 for paramedics to come out and assess him if he has another episode of confusion, or call the ward at any time. I think we both feel a bit more reassured that they are on the case and will respond quickly if necessary.
I made the poor thing remove most of his clothes at the door and go straight to have a shower. His clothes are bagged up to sit in the cellar and de-virus themselves for a week before we wash them. I'm getting him to eat in other rooms from us and wipe door knobs, etc. It sounds like there were very few people at the place where they did the MRI and the staff all had protective equipment so I think he probably didn't get infected or infect anyone.
He's clearly very anxious, but he's managing to watch TV and will go to bed soon. Mental confusion is his absolutely worst fear (he's also an academic, recently retired) so he finds these brain symptoms really distressing (though I suppose anyone would). I'm sorry to keep hijacking this corona-anxiety thread with my brain-lesion anxieties, but for me they are very much entangled.
I'm now back to being the one who has to do all the cooking, etc. Its a bit of a distraction. My worst issue at the moment is really crippling lower back pain, caused by lack of walking and by sleeping on my front for my lungs, which causes my spine to curve too much (I have disc and other spine issues). Not really sure what to do about that - the paracetamol is really not cutting it.
Good news is the amazing support we are getting from friends and neighbours with shopping and lifts and general hand-holding (metaphorical). And the support on this thread, for which I am really grateful.