Hello Patricia.
I have gone through you post. From what i could gather, your husband has been a teacher for last 30 years and was fine until about 4 months back when he started getting more fatigued, forgetful and indecisive.
At this age, after family troubles, he might develop reactive
depression, which might manifest as low mood, poor attention and concentration resulting in forgetfulness, a deterioration in sleep and appetite with occasionally expressed sadness. A more sinister development at this age might be some organic lesion of the brain like cerebro-vascular disorders or
dementia, though 58 is a little early for dementia, which at the initial stages might present like this.
At the initial stages, these findings might be missed by a physician who is not sufficiently trained in eliciting these disorders, particularly the subtle signs. Therefore i suggest you visit a qualified
psychiatrist and get him evaluated, clinically and using both
neuroimaging as well as neuropsychological tools, to get to the problem and then follow the management plan as prescribed.
Hope this helps
Regards
Dr A Rao Kavoor