Thanks, OP. I am sorry DS has a disengaged AA. What you’ve said is awful. No one likes to lose students from a degree programme but the only responsible thing to do with a student presenting the type of concern your DS conveyed to his AA is to explore it, and help the student act in their best interest. It doesn’t even take much effort.
So this lousy AA is not likely to be helpful. When DS gets sorted - not before, because that will look like sour grapes - he may wish to report his experiences with this person to the Senior Tutor or Director of Studies. If he finishes his degree, in his final year he can fill out the National Student Survey and let loose.
There should be a Student Services Officer in his School. That person is often a gold mine of helpfulness. If you live close by, could DS pop in to ask them to help him think this through? Check to see if he needs an appt. He could also try to get an appt at the SU to do the same, on the same visit.
BTW Head of Faculty has no role in what’s going on and can only pass messages down the line. Some HoF will take the opportunity to light a fire under someone who has been slow but it is a bit tricky to figure out what has happened here, between due process, annual leave, business travels and some muddled communications from DS.
Could part of the problem be not getting into Medical School and not really coming to terms with that? Financially, the Home Medical School ship has sailed so DS needs to find a path to a satisfying life. I know this is tricky because it is only a guess on my part and even if it is true, he is probably in no mood to discuss it with you.
If Medicine is the only thing that will satisfy him, one possibility is to get through this and think about whether adjacent clinical roles or medical research roles could provide a satisfying life. Another would be to consider the possibility of an Overseas Medical degree. In that case , DS would need to research the settlement HMG has made with the Medical Residents to see whether he could eventually practise in the UK. If not, how would he feel about living abroad (where a doctor’s life may have significant advantages)?
Loads of people who did get in to UK Medical Schools are failing or declining to complete training. There are several threads on this around the strikes. Unless DS is so motivated that he is willing to do what it takes to study and perhaps practise abroad (including earning the fees) he may have dodged a bullet. I know that may be small consolation now, however.