I found that the process makes you stronger. Hopefully you get help when you need it from family and friends. Once you get confirmation that he is on the Dementia Spectrum, you can seek help and advice from your doctor and the Alzheimer's Association.
David was too old for most of the study programs. But we did participate in one testing a pill to cure Alzheimer's. Turned out the medication wasn't helpful. But that process was a course of action that we did that was proactively taking on Dementia. The study taught me a lot. And there have been successful studies that you may benefit from.
His GP put him on Namenda and Donepezil early on. And he was advised to receive cognitive therapy. Through that we found a geriatric physician who did studies on treatment. We saw him for 9 years. He was the expert we needed.
One thing I recall reading was how to be empathetic to the oddities that may emerge. One suggestion was to try to get dressed with gloves on. It helps to put yourself in his place. When it finally occured and I needed to help David get dressed, I was ready. But there were so many odd things going on. You learn about visual spacial problems and how it manifests.
I hope these things help you prepare for the future. There have been advances in treatment. I hope that you and your husband can benefit from them. And from others like me who completely understand and want to help.