Very late to find this thread...
DS1 has been at university for 2 weeks now and holy crap - what an exhausting and emotional 2 weeks.
He was struck with crippling and unexpected homesickness (he had been really looking forward to going) and that brought on insomnia, severe anxiety and full blown panic attacks, that basically made him lose all confidence in his original course selection and ability to handle the workload. He thankfully got great support, and things already seem to be improving hugely, but in an attempt to stop him ditching uni entirely (he's on a full academic scholarship - no tuition fees - opportunity of a lifetime!) we encouraged him to switch to a broader and less academically intense course.
Now that he's feeling better he's questioning the swapping and is describing a lot of his lectures as far too easy, but if he hadn't swapped, he was 100% heading for a breakdown and refusal to stay at the university at all.
Hopefully he can either accept his new path or work out some way to treat this year as an adjustment period and go back to something closer to his original plan next year. That would mean having to pay for his final year as he'd be taking a year longer to get his degree than his scholarship covers, but he's only 17, so it wouldn't even be noticed that he's done an extra year once he graduates.