Hi, Cavkid. You cannot please everyone. You can only do what you think is best at the time.
Xifaxan is often given along with Lactulose. It's an antibiotic that helps with GI symptoms and most patients do better when given Xifaxan and Lactulose rather than Lactulose alone.
I suggest you see if you can get some in-home nursing care. You are going to need some help. I'm glad to hear that your sister is helping out, but what happens when she leaves? It's best to get a plan in place. If the doctor thinks your dad has 6 mos. or less, he can be referred to Hospice. They do send nurses to the home and also provide respite care for caregivers.
I agree that there is no point in arguing with your mom, just as there is no sense in arguing with someone who is drunk. However, you do need to set some boundaries and have her abide by them. Talk to your family about what you will and will not allow and stand firm.
Cavkid, thanks for the update. Glad he was able to obtain the Xifaxan. Let's hope he can keep his meds down. If it hasn't been prescribed, you might want to give him OTC Zantac or Tums, to be taken before he takes meds. This will protect his stomach and perhaps also help him keep the meds down.
I do agree with Sandi about the Medical Advocacy and POA. And with you about not getting caught up in an argument with your mom. Don't get sucked in! It will do absolutely no good for you or your dad.
Thoughts and prayers,