I worked with a woman and she'd get sick every time her father went out of town (he was the owner of the company I worked for). It was almost funny but her mother had died a couple years earlier, etc. She'd have some catastrophe or another and we'd all wait to see what it was going to be "this" time (and how we could help her).

Maybe you can write you and your father a letter or "contract" with ideas on how to improve and run it by your therapist? At least outline the problem you need help with this time?