Hello Chiefgroover,
A change from 12 to 19 on MMSE is a profound change indeed.Congratulations.
I've been planning to build a helmet for my wife's Mild Cognitive Impairment but recently came across an article by Dr Rowen about using a single LED with a wavelength of 810 nm that is positioned to shine up one nostril, where access to the brain is through a bone much thinner than that of the skull. A U.S. company Vielight makes such a device designed to pulse at 10 Hz. Cost is around $500. However the LED costs about $3.50 online and the pulser circuit using a 7555 i.c. costs less than $5 in parts so I'm building one. Dr. Rowen's article on the Chinese research can be found at mediclight or google search The device is used for 25 minutes once per day. Green tea has been found to greatly augments its effect.
A similar intranasal device but using an LED of 630nm can be found on ebay. An Israeli company sells one for around $50, the Chinese version "Ostone" is about $20. I suspect both are made in the same Chinese factory. Each has a 5 minute timer but does not pulse. This device is designed to maximize production of the signaling molecule Nitric Oxide in the nasal membranes contributing to dilation of blood vessels throughout the body.
I expect to have the device built in the next week and will report the results.