Some advice I came across today that may help you in this time (and perhaps others in this thread)
https://twitter.com/TheRaDR/status/1...670718464?s=19
As for your son, one thing I can recommend when he looks at courses is to look at doing smaller course loads, especially to start with. That can give him time to adjust to the rigour of University without being swamped right out the gate. Depending on what he's looking at (and your University) he might be able to do some prep work to allow him to ease into university courses (might only be a thing in Maths though).
University is hard yes, but I'd say the trick is to find something that gives you the will to keep on at it. Otherwise you'll be stuck at the end with a really expensive sheet of paper.
Not sure what other resources are available for you but if he doesn't have a solid picture of what he wants to do, things searching things such as "what can I do with X degree?" is a good start.
On that particular topic I can help a bit more, as I am now 6 years into post secondary school/work, though some specifics may be different from university to university.