My brother got in bike accident. Dr said potentially grade 3 TBI.

Hi, I’m new here, something happened while my brother was he was riding his bike like he does every day. Witnesses said he just flew off the bike. EMTs took him to the ER. I’m in another state while my parents are with him at the hospital so I’m getting second hand info. The dr said it’s a grade 3 TBI, he doesn’t know his own name but he was conscious until they gave him dilauded. They did a CT scan but said the imaging was muddle from blood (he has a Seborrheic Hemorrhage), he also has a minor fracture the Dr is said he is not worried about, drs biggest worry right now is stroke. I guess I’m kind of freaking out after reading about a grade 3 TBI, they will be doing another CT scan later. Is there anyone here who has experience with a grade 3 TBI? I know he is in the right hands right now, but I can’t help but be so worried being out of the state and not there. He can recognize my parents but can’t recall anything like his name or what happened in the last few weeks. I understand that TBI cause long term issues. I’m just so worried, I probably shouldn’t have googled it, but here we are. It’s so hard seeing him with the neckbrace, and bandages all over his body I just want him to be ok.