my dad terrifies me sometimes?

so since i had been taken away to a boarding school (i came back home a year ago, was there for almost 4 years) my dad hasn't been the same and it terrifies me.

i was supposed to have an appointment with my diabetologist, for my insulin pump but i hadn't been feeling well since yesterday, now my dad didn't seem mad at first, infact i constantly apologized and said that i felt like vomiting (still kinda do), but then he kept yelling at my mother afterwards (although i didn't hear because i listen music at a volume that should've made me deaf years ago).

i genuinely don't feel that safe with him anymore, but i just hope he gets help. i miss my silly dad.