[noobiemcfoob]

I'm not a qi gong practitioner (had to look it up...), but I relate to the sensations your describing. Using the devices too much leaves a type of buzzing in my head. I've always described it as bunch of voices, all the different ideas I tried to absorb or started thinking about while using a device.

[blackSnake]

Anything that consciously makes you aware of your stomach area, what the Chinese call the "Dan-Tian", will rebalance your energy.

If you are interested in the topic, there are a bunch of great books about the subject.

Check out "The root of Chinese Qi-Gong" by Yang Jwing-Ming.