Practical things to ponder:
He is in a better position than he was last week - you can't treat what isn't diagnosed.
He's in good hands - they found it, they didn't hang about, a plan is coming, so his symptoms will start to improve and he'll feel better shortly.
He has access to the best of treatment, free, at the point of need.
If he has to go into hospital - get a couple of extra long chargers for all the gadgets. You both need a little bag with ear plugs, lip salve, some sort of shawl, cosy socks, a coffee cup to keep coffee hot in and a water bottle. Take a pillow or one of those bean bag head rest things.
It's worth speaking to your GP. You might need some support from them for yourself - you have to learn to cope with a whole bunch of hard and, you will, but something to help you sleep might be wise.
Well done, you saw it, you got him to where he needs to be. They'll take good care of him. We'll help you take good care of you.