Thank you everyone for the information, I REALLY appreciate it. I've shared all of this with him and I think he's trying to digest it all right now. He hasn't had any more episodes of just blood since the other night. He does occastionally get blood streaked sputum, but it's very minor in the amount of blood.
We will be keeping an eye on this and I have requested that he please call his doctor. Thank you again, we both really appreciate it!