--I came up with a few sites that promote dissolved oxygen in a liquid of some sort as a supplement, but I don't know if there's any efficacy to this (I suspect not).

The only other liquid oxygen I know is rocket fuel, such as spacecraft and missles use. It is oxygen frozen down to hundreds of degrees below zero Farenheit and packed under great pressure. (Don't think you can use that for neurological symptoms.)

One other thing--as a diabetic, do be careful how much fruit juice you consume; it can be quite a load of sugar to handle at once. Most dietary experts seem to feel it might be better to eat a portion of the whole fruit--more nutrients and fiber to keep the sugar absorption rate more stable.