Prayer is tops.
I'm not asking you to post answers, just some things to think about.
Has an elimination diet been suggested to eliminate food allergies?
Upgrade your home air filter to one of the better grades?
Anything change environmentally in your world? New plants, new car, furniture, animals, etc.?
I was just thinking the other day how much I've evolved in my memory strategies. I can't hardly remember anything if it's not on my calendar, in my contacts or in email. I started using a Daytimer in the 90's and evolved into using Outlook as my Daytimer. It's almost, If it doesn't exist in Outlook, it doesn't exist in my brain. I also gave up Facebook because, this may sound silly, but the the short bites I felt like were affecting my ability to concentrate on longer task items like reading a book, or even a long article.
Is the issues with technical the determination to soldier through isn't there, or the logic seems weaker? or both?
Also, hard for us guys to admit, but could it be depression? I've never been formally diagnosed, but I know I struggle with it some off and on. It can affect the way you process cognitively in many different ways.