Just to answer your follow up questions.
I have a big notebook I take notes in, at the top of the page date and time of the meeting, where the meeting was, and the specialty - If I can get it the name of the person I spoke to I add that too (but there are lots!)
Then just bullet points of the situation and what the next steps are, details on where and when this will happen and who to call if we don't hear anything by a certain date or time.
Then contact details of wards (if admitted), visiting times and arrangements for booking visiting and how many visitors allowed (and if young children are appropriate, in all honesty I would avoid young kids visits and visit downstairs in the coffee shop if he's well enough to come down, or keep the visit very short - dh was on a neuro ward, and some people were very ill, not that dh was much better), but it just wasn't the place for them.
You'll probably need a couple of poly wallets in different colours, as you may well be under different specialties who kind of pass the patient parcel to parcel, so radiotherapy, surgery, anesthesia and chemotherapy are all run by different teams with lead consultants.
You won't be walking this path alone, scary as it is, and there is always someone worse off in the waiting area.