As I look back on the initial stages of our journey, there were no "dramatic" happenings which led me to believe my Hon had Alzheimer's. At his young age of 58, this would never have entered my mind - Alzheimer's affects "old" people, right?
If you have a concern about a loved one, look for deviation from normal in the small things. In my experience, the disease doesn't manifest itself one day - like measles, etc. It's a slow and very puzzling process. But the catch here is, the puzzling stuff keeps happening til it becomes more serious and/or noticeable.
Persons suffering in the initial stages are very adapt at masking or "having a system" to get thru their day. Remember, they too, are stressed about what is happening and very confused.
If you feel a loved one has a problem with "deviations from normal", get to your family doctor ASAP. He/She may hesitate and chalk it up to stress or a million other things but get pro-active. Request a full work up of tests to eliminate any physical problem.
And remember, it takes a geriatric psychiatrist to be able to diagnose the disease so get a referral. They order the scans and MRI's, etc.
With the new medications, time is of the essence.