So on Friday a friend of mine tripped in the dark and hit his head on a bookshelf, which resulted in a decent gash (didnt get a good look at it but I'd say it was at least an in long, and looked fairly raw or like exposed tissue- more than just a nick or cut) and bleeding. He and I carpool to work , and once he got to work people told him to go to the hospital/go home. He went to the hospital, and the doctor said he "should be fine" after cleaning the wound. Now he's been throwing up all weekend and hasnt eaten anything since the day of the injury. He says he's been feeling feverish as well. Are these two related? If so, what could be the issue, and what should he do? He's a redditor as well, and I encouraged him to ask reddit about his injury but I don't believe he's been on since he's dealing with both a head injury and puking/fever.

UPDATE Thanks for all the replies and concerns. I've had sort of mixed responses and feelings about this thus far... As of yesterday he is back at work, not throwing up anymore, eating again, and he never went back to the hospital. He seems to be doing fine, and he SAYS he's fine, as does the doctor he went to at first and a couple of people with medical backgrounds. He seems to think that people are making a bigger deal out of it than it should be, though I do like erring on the side of safety. Anyway, just so you know, he's doing fine, though I am still on the lookout for any delayed after effects of the injury. Thanks for all the concerns!