It sounds like you feel hopeless. I can only imagine how you feel. However, I hope that you won't give up and that you will look around for help with PKD and find others who are living well with PKD. At 64 you're way too young to not consider all options for treatment,
Although you've been told your abdomen is too distended to do PD, I'd suggest getting a second opinion from someone who knows a lot about PKD. There are PKD clinics across the country. If you're not already getting treatment at one of these clinics, it might help to talk with them about your options. (https://pkdcure.org/living-with-pkd/working-with-your-doctor/find-a-clinic/).
I've known patients with PKD who did PD successfully. Here are some studies:
* 5 year French study found PD was a suitable option for PKD patients, https://www.ncbi.nlm.nih.gov/pubmed/21115669
* 10 year French study found that large PD kidneys didn't rule out PD and patients did as well on PD as HD. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4377775/
* 15 year Turkish study of patients with PKD that found patients on PD didn't have more complications. https://www.ncbi.nlm.nih.gov/pubmed/27320369#
I've also known patients who did home HD. Today one of the machines for home HD has been approved for patients to do without a helper. You may consider it cruel to expect an adult child to help you do home HD, but those who love you may see things differently. When you need dialysis, you can ask the clinic to train you with more than one person and you can learn to do everything yourself so all your care partner would need to do is to give you a hand if you need help.
If your kidneys are causing you discomfort, you might need to have them removed at some point, I have a friend who has PKD. She had very large kidneys removed while she was on dialysis. She had a successful deceased donor kidney transplant several years ago. Here's a study that looked at PKD patients who either had their kidneys removed when they had a transplant or had their kidneys removed in a separate operation. The results seem to suggest having separate surgeries is better. https://www.ncbi.nlm.nih.gov/pubmed/29224797
In case you don't know about it, the PKD Foundation (https://pkdcure.org/) has lots of resources for living with PKD, including clinical trials on treatments for PKD that are recruiting or active. If you're looking for nearby help and support, the PKD Foundation has chapters in 34 states and DC.
I hope you will reach out to other people with PKD, including those who have experienced kidney failure and who have found a treatment that works for them. Although it may not seem like it now, you can live a good life after kidney failure. I've seen many people with PKD who do and I hope you will choose to give yourself that chance.