I'm scared my therapist is going to ask me to do PHP tomorrow, and I'm scared I'm going to say yes because I might feel desperate at the time even though I really don't want to do it, and I'm scared they're going to say I'm "too sick" (because I have heard of this happening) for PHP even though a lot of my problems are caused by lack of sleep and Hep C, and I don't think not eating/purging is really causing a significant amount of harm in comparison.

What are the criteria? Is there a certain weight/BMI or lab results or anything?