So sorry to hear about this.  Sounds terrifying.

I suppose the trouble is that even people who have experienced cancer all do it in different ways , dependent on so many factors: type of cancer and severity, family circumstances, location, individual relationships, waiting lists.  So it's very difficult to compare situations and give advice that is relevant   And if you haven't had cancer, it's one step further removed from being able to step into someone elses shoes.

The waiting for results is a horrible part of the process .I have often found that the fear of things is much worse than the actual event and I've surprised myself by how much I've been able to cope with!  But then everyone is different.

If there is another cancer diagnosis, objectively speaking is there anything you could do differently/ add to ease the situation?  Presumably this is something you could discuss with the therapist and at least he / she is already in place for you.

All the very best with everything.