Hello- Thank you for asking the question here at JustAnswer. I have read what you have written and am happy to respond.
Agnes, I am sorry to hear about these problems your husband has been experiencing. Of course, you want to rule out any medical problems by if his family relates that this has been part of his long standing history, it sounds to me that he has a form of Adult Attention Deficit DIsorder that may further be complicated with a depressive illness.
You can learn more about Adult ADD at the following link. I also suggest that he take the Adult ADHD quiz as it will give an immediate result and provide recommendations for treatment.
Here is the link: http://psychcentral.com/addquiz.htm
Should he have adult add, he will need to see a physician for some medication.
I trust that this jhelps to answer the question,
I wish you the best, Bill
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