help #throwingup

This Is my 3yr old cockatiel, Ollie. He has been fine all day and I just got home and there was matted feathers and somthing that looked sticky? All over his face. I looked at what he could have gotten into but I left nothing open. I'm afraid he threw up or somthing. Please help, it's night here...

So not long ago, my bird was acting very weird, bobbing his head very rapidly, and not long after, there was this liquid with food combined in his mouth? I don’t know if he threw up or regurgitated we was eating it, then after he was trying to “mate” with me, so I’m not sure if he was on heat...