I wish you the best and hope that you can find the strength and support to do what is necessary to restore a more comfortable lifestyle for yourself and your husband.
As men age many experience prostate enlargement. The diagnosis becomes confusing when Parkinson's disease is present but it might help to discuss the possibility with the primary care physician.
We went through this issue many months ago after my husband stopped taking the herbals for prostate help. He, of course, told me that he was still taking them. What he did - and again told me the opposite -was to stop drinking fluids except those needed to swallow pills.
After serious side effects from dehydration, we finally eliminated all but a UTI or prostate enlargement. There was no UTI so prostate remained. He is on medication which has helped significantly. No longer "racing" to the bathroom because it feels as if he has to urinate every 20 minutes. No longer centering our lives around urinary frequency and urinary hesitany.
I know how difficult it can be to deal with someone who is being unreasonable about personal care and lifestyle. Pull-up pants seem logical and thank goodness my husband was willing to use them while there was such a serious problem. But they are expensive when you use several a day. He didn't like the pads.
An external catheter seems reasonable if he is willing to cooperate in maintaining a "normal" household-social routine. If you need support in discussing the matter with him, enlist either family or medical assistance.
It is unfair to cut off social contact for the caregiver and/or the patient because the living room has been turned into a water-closet.
Whether the cause is PD, prostate, medication, dementia, the problem must be addressed. Chaos is not a good place to be. In the long run, the caregiver will be in need of mental health treatment and there will be no one to care for the patient.