Is my dad OK? Red face, shaking hands symptoms?

Anonymous
I lost a library book from school and asked my dad to keep a lookout. He got mad, complaining about how they're expensive, etc. I'm the youngest, so I've always been the baby of the family, my dad just recently is treating me like a grown up and I'm already used to it. I'm not emotional like my sisters, so I sighed and went on while he poked at me for "hhhhhhuuuhh-ing him." I didn't show visible signs that I was upset, nor was I. Sometimes dads can be ridiculous.

While the family was eating dinner, my dad's face got pink/red and he closed his eyes hard and his right hand which was supporting his head was trembling. I asked him what was wrong, he didn't answer. After he moved, I asked him if he was feeling alright and he said he's OK and just didn't eat anything and that he should've. I kind of teared up because he apologized earlier and which I did not reply, and he could've died right then. Anyway, what do these symptoms sound like?

TL;DR Lost a library book and dad got mad at me. Later his face got flushed and his hand that was supporting his head shaked. He said he just didn't eat anything today and should've. What's wrong?
Is my dad OK? Red face, shaking hands symptoms?
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