Have you tried to explain to your dad how much distress you're in and that you're trying but you just can't "suck it up" Sometimes parents don't always have the right answers, maybe he is struggling with how to help you and that is the only way he knows how.
Rohag gave some good numbers to try...maybe that's a good place to start.

I know as a parent I don't always know the right thing to say, maybe give your parents another try?