Jess, I'm so sorry you're going through this
Off the top of my head - and I'm not a doctor - this doesn't sound like Cushing's. I'm wondering if some of his issues could be side effects for the anti-anxiety meds he's on
Teen years can be an issue but this sounds like more than normal. Can you go back to the doctor who prescribed the meds and see if there's something that won't make things worse?
Unfortunately, your photo links don't include photos but email text. I can remove those links, if you wish. If you email those photos to email@example.com I'd be happy to post them for you.
Best of luck to you!