You have difficult choices to make, and not much time.... Do you have a good herbalist in town? That is who I would ask these questions, someone who is familiar with the herbs in Clarkia , which is really no secret. Or a naturopathic doctor, certainly not an allopathic one.
Without wanting to confuse you any further, have you looked into intravenous hydrogen peroxide treatments? I guess this is only possible if your father is not hospital bound. Doctors who do chelation therapy would administer this. Look under chelation and also under oxygen therapies, or search under intravenous hydrogen peroxide. I have seen people get amazing results with this, people who I talk to when I take my mother for treatments.