Hi there
I posted this (underneath) at the end of July and, given that you were all so much help, I thought I should give you an update. Shortly after I posted this we got an emergency appointment with his diabetic nurse. She first of all suggested a glucose monitor patch, which he has had for about a year. It's a hundred quid a month but we were desperate. She then suggested an insulin pump - fine, but do you really think his problems are all caused by diabetes? Because I was a bit more confident having been on this forum, I pushed it and we got an appointment with a consultant endocrinologist at the end of August. The consultation started with the usual "maybe we should swop Lantus for Levemir" conversation but we had rehearsed our presentation which went along the lines of "here's what I used to be able to do, even though I have diabetes..." Something must have clicked and he booked an emergency MRI. He called yesterday to tell us my son has hydrocephalus and it could have been caused either by frequent overdose of glucose or physical damage to the head from passing out due to hypos. We'll see the neurologist next week after they've completed more tests but I just wanted to share the situation. The moral of the story is that once you have diabetes, it's hard to get attention away from it. When we asked our GP for medical evidence for him to interrupt his university course, they put the reason as "poorly controlled" diabetes! The best advice came from you kind people, who emailed to say "no, it's not".
So thank you all.