Sorry to hear that Clemson. Injuries are tough. Mine went through one where his first doctor told him to find a running sport. It's been a long slow recovery, and it's put him behind in the college recruiting/search process...but at least he's not playing s0ccer.
Give it time. Worst thing to do is rush things. Don't jeopardize college time to rush back for a little HS senior time. There will be setbacks...expect them so when they happen they don't hit him as hard. By not rushing back, hopefully those set backs will be minor not major ones. When he comes out on the other end, he'll find out things about himself he wouldn't have known otherwise. It's just not a fun journey. But he'll be stronger.
It really hurts when your child is hurt...you feel helpless.