Have you tried gluten free ginkgo biloba bee pollen salt lamps?

Sorry, I had to. But here's an actual real suggestion that may or may not be any better. It's a working memory trainer that I feel has slightly helped improve my own working memory called Brain Workshop. Obviously proper diagnosis and medical treatment would be preferred.

https://brainworkshop.sourceforge.net/

Edit: one other thing that may legitimately be the issue, worth checking even if unlikely: get a Carbon Monoxide detector.