I'm no expert and do not have the experience, but IMHO ...

Your dad needs help.

Maybe your age is a factor in your being able to leave, but whatever the case, you need to get out of there until your dad gets help. Maybe you can tell him something like that as you leave again. Be sure you're on your way out the door because you want a place to go if the comments set him into a rage.

Look for a teen shelter or a women's shelter in a larger city. They will care for you and protect you. They will even help hide you. Maybe this seems like an undesirable alternative, but an even worse alternative is for you to give in to your dad or for him to go further than he has. That is a life-time problem, not just an event.

There are some ppl here who can give you sound advice. Maybe you can even email or chat Doc John.

Congrats on your 27 days. I'm proud of you!

Trent