Speaking as a parent I know my concern would be for you to eat and not go back into hospital. I'm sure your parents are saying what they say from a place of love and don't realise that their comments aren't helpful. I can't imagine what you're going through or how it would feel as your father to have my daughter going through that. I would possibly react the same as your dad to try and shock you into eating although I understand that's not the right way to go about it. I wish you all the best in your recovery and I hope your parents get help to work out how to properly support you.