Everyone that knows Rocket also knows he's very sensitive about his privacy and I'm sure to pay for revealing any of this, but
While Rocket was home he needed to see his doc about problems he has been experiencing with unusual winding and fatigue. After a CT it was revealed that his aorta is partially blocked (calcified). On top of that, he had to deal with a month-long passing of a large kidney stone while still playing--try that!
He returned to continue on but based on the blocked aorta, he'll probably have to cut his summer short.
If he wants to discuss it further with anyone (doubtful), I'm sure he will.