From my own experiences, it's vital to ensure your GP will discuss things with you. After all, if hubby isn't competent enough to talk for himself, you're the one who has his best interests at heart.
John had AD for 12 years, and, once he was prescribed Aricept, his illness was on a plateau for a few years. But when I needed him to discuss things, either with him, or anyone else, he was adamant there was nothing wrong with him, and would have the most terrible rows with me after, so, when I had to talk to a "professional", I prepared a statement "To Whom It May Concern".
On this, I listed how things had changed, which I updated regularly, and on a separate sheet I listed all his medication. Then, when we visited the GP, or a doctor at the hospital (he had several other illnesses), or a Social Worker visited, I made sure they had a copy of the Statement, so that I didn't have to explain anything.
When we visited the Memory Clinic, I would go to reception, and ask if Dr XYZ could see this, prior to us being called in, and this meant they didn't need to ask me questions, where my replies would distress John.
I would stick to the maxim "go with the flow" as far as talking to John about things, because he truly believed there was nothing wrong with putting his car keys in the freezer, and accusing me of taking them, the same way as he truly believed I was having affairs with all and sundry.
It's an unenviable task, being a carer of someone with AD, and personally, I don't think people in the Real World, who haven't experienced this first hand, have a clue what our lives are like. Thank goodness for TP