I made myself throw up after every meal for a week so I wouldn't gain weight back on a family trip
Why would you make yourself throw up?
My dad paid thousands for the trip and I promised I wouldn't gain weight while I was on it.
You shouldn't have to throw up to be healthy. You should treat your body in a healthy way and try to lose weight correctly if you want.
My dad just wants me to lose weight faster. It doesn't matter.
I'm really concerned that your dad supports you losing weight in such an unhealthy way. Is there anyone at your school that you could talk to about this?