Why do I get so mad at my dad?

Nothing is wrong with you! I get angry enough at the evening news that I want to turn it off, and I don't even know the dingbats who are annoying me. Not to mention the jerks who spend the last ten minutes of it talking about football of one sort and another. And even thinking about my long-dead father raises my blood pressure. Forget about what's wrong with you. Tell us what's wrong with him that is winding you up, and we may be able to help - even if it's to say that you need a break so that you can calm down.

Nobody knows how to find our hot buttons like our parents do, they helped install most of them.
Any possibility you are approaching burnout?

Your feelings are not uncommon. Can you give us some more information? Does your Dad live alone, or in a nursing home or do you live with him and take care of him 24/7? How far along is his dementia? What are your ages? Is anyone helping you with him?