He has become intractable. He won't take his meds without an argument. He is 76 years old. He has become obsessed with sex and porn. He has never been like this, ever! He sleeps a lot, his posture has changed, He will watch the channel 9 news loop for hours etc, etc. Where can I get help so that I know what I am dealing with! I am so angry. What is wrong with me. I also scared.
I suggest you read this 33 page booklet (a free download) which has THE best information ever about managing dementia and what to expect with an elder who's been diagnosed with it.
Understanding the Dementia Experience, by Jennifer Ghent-Fuller
https://www.smashwords.com/books/view/210580
Jennifer is a nurse who worked for many years as an educator and counsellor for people with dementia and their families, as well as others in caring roles. She addresses the emotional and grief issues in the contexts in which they arise for families living with dementia. The reviews for her books are phenomenal b/c they are written in plain English & very easy to read/understand. Her writings have been VERY helpful for me.
The full copy of her book is available here:
https://www.amazon.com/Thoughtful-Dementia-Care-Understanding-Experience/dp/B09WN439CC/ref=sr_1_2?crid=2E7WWE9X5UFXR&keywords=jennifer+ghent+fuller+books&qid=1657468364&sprefix=jennifer+ghent%2Caps%2C631&sr=8-2
She also has published a workbook entitled, “It Isn’t Common Sense: Interacting with People Who Have Memory Loss Due to Dementia.”
https://www.amazon.com/Isnt-Common-Sense-Interacting-Dementia/dp/1481995995/ref=sr_1_4?crid=2E7WWE9X5UFXR&keywords=jennifer+ghent+fuller+books&qid=1657468655&sprefix=jennifer+ghent%2Caps%2C631&sr=8-4
The 36 Hour Day is another very useful reference type book you may want to purchase; it will answer questions you have on the spot relating to DHs issues.
Teepa Snow has wonderful videos on YouTube to watch. She is a dementia expert with wonderful tips on how to deal with elders suffering from the condition. It's how you approach them that can make all the difference.
All that withstanding, you may reach the point where DH (dear/damn husband) becomes too much for you to handle at home, and he needs to be placed in Memory Care Assisted Living. Or at least sent off to daycare during the day to give YOU some respite. Or sent TO respite care for 2 weeks in a Memory Care AL while you get some rest. If it works out, then you can place him there permanently.
I used to work as a front desk receptionist at a Memory Care AL; I'd visit with wives who had no other choice but to place their aggressive dementia ridden DHs in our care. They'd come, sometimes daily, to visit, bringing snacks & small gifts. They'd get to go home to safety and no chaos, too, while their DH was cared for in our facility. There's no shame in admitting the need for such care, for BOTH of you.
You can tour some local Memory Care ALFs to see what you think. Or at least look into in home caregivers to come into your home to give YOU a break. In the meantime, call the doctor about his ISB asap.
BEST OF LUCK
Perhaps, as JoAnn said, some meds might calm him and help him be re-directed to better activities.
My FIL also became 'obsessed' with porn. Cleaning out his condo after his death was an eye opener. He was far more into that than anyone realized. To be kind to his kids (My DH and his sister) I never told them the 'depth' of the stuff I found and destroyed. They needed to respect and remember their dad as he was, not as he became the last few months.