Suspect that DH's memory is failing - how do you cope?

I'm not sure how old your DH is sandelf78a ? But I'm only 55 (well I say only ) and have been like this for many years due to an ongoing neurological condition. It has been getting worse recently and now I sometimes find myself searching for even the most basic words which can be very frustrating and embarrassing (especially at work).
As far as I understand this "calling up words" thing can be associated with several neurological conditions but can also be just a symptom of getting older. Probably an idea to ask your DH to pop to the GP about his hearing loss (if indeed he has this) some men can become very selectively deaf.

It could be that the hearing problem is making him more irritable, could you persuade him to go for a hearing test?

Not sure about calling up words, I think this happens to all of us at times, and needn't be anything to worry about.