Hi Sal,
Welcome to the forum and big (((hugs))) us Mums need them too and by the sounds of it youv'e a lot on your plate at the moment. I'm a mum to a T1, 10 1/2yr old and to a 13yr old son, so i know a bit about teenagers and a diabetic child (just not both together, yet!.)
Naturally your son is feeling angry, frustrated and perhaps a little out of his depth. It's early days and even my Andrew gets annoyed with being diabetic and having to inject and constantly take his bs.(his favourite words are "in a minute!") Anger is a proccess of not being in control, and thats what your son feels right now.
But be careful, both high and low blood sugars can make them aggresive and unco-oprative, and we found Andrews behaviour was very aggressive whilst on Lantus.
Try to be patient and let him browse the forum, that way he'll know he's not the only one, and may take some advise on board,
Take care and good luck,
Suzi x