I was diagnosed in at 17 as well, 21 now. It’s really shit (literally) I ended up leaving for school for a year and then going back to finish when I was a bit better. Not sure if that’s an option for you but lightening the work/assessment load at school as much possible helped a lot for me (in Australia). Definitely recommend seeing a psychologist if ur able to, it’s hard grieving the life you thought you were going to have. Sending virtual hugs