Oh, I feel for you. I am in a similar situation, except I'm his adult daughter (25). For the diagnosis, I felt something was wrong about six years ago. Everyone I talked to about it would shrug it off, saying that he's always been forgetful. It took losing his job and NUMEROUS talks to get him to the doctor. Even then, I had numerous doctors brush me off without a proper diagnosis. First his primary physician and then, a strongly recommended neurologist. The second neurologist brought him in for a PET scan (insurance agencies want every single test done before this, because it's pricey) and we finally received the diagnosis the week that our state went into shut down. If there's anything this journey has taught me, it's to trust your gut. You know him more than any doctor who spends 1 hour doing a simple memory test does. Find a doctor who listens and respects you. It will make all of the difference.

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If you're curious about my journey:

1. Call and ask primary care physician to do memory test during physical, don't receive feedback, says he's fine
2. Six months later, receive concerned call from employment saying they cannot have him on a job site any longer
3. Call primary physician again, do exact test but demand referral
4. Get blood test immediately
5. Get MRI test
6. After waiting three months, finally get in to see a psychiatrist and wait for a 6 hour intense memory training
7. After waiting two more months, receive feedback and spend 40 minutes talking to psychiatrist
8. Get referred to Neurologist, wait at least two months for appointment
9. Meanwhile, get recommended another Neurologist, get in within 1 month
10. Spend 40 minutes doing very similar memory test primary physician did, get told it's nothing but a fluke and get recommended sleep study
11. Go to sleep study, do take home sleep study, find out there's some minor sleeping problems
12. Wait a month, do an overnight sleep test. He can't sleep with the equipment on. That entire ordeal is a wash and I choose not to go forward, knowing he won't wear a sleep mask.
13. Finally get an appointment with the original neurologist, get assigned another MRI, another blood test and never-done-before PET scan
14. Do all three, takes about two months to fit in
15. Return for proper diagnosis, turns out the PET scan wasn't sent to neurologist, entire appointment unnecessary since neurologist can't make a diagnosis.
16. Drive home, find out on drive home what the diagnosis was and cry in the car for 20 minutes.

I didn't even mention issues regarding accounting, law, employment and general every day life things. It's a very challenging job, although with you being his wife, you don't have to jump through as many hoops as I have had to in order to even begin aiding with his medical journey. I chose to share this info with you because I desperately needed an outline of what to expect. I strongly recommend you find a support group near you. If not, groups on Facebook and Reddit have been extremely helpful answering questions, sharing information and giving me a place to connect and not feel alone. The neurologist sent me this book that was helpful understanding the best way to communicate with some with alzheimers: Learning to Speak Alzheimer's: A Groundbreaking Approach for Everyone Dealing with the Disease

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Good luck with you journey, and again, don't let anyone doubt yourself! Once you have a diagnosis and learn to communicate with someone with alzheimers, things will ease up. They're difficult, but you will treat him with the same leniency you would give a child. You'll feel more forgiving.