I agree; correct training is the key to avoiding these kind of side effects to training in IMA's.
What you call 'running fire' we call 'head fire'. From what I do, this is a side effect of training the yi really hard. We always do a set of Qigong exercises at the end of class to 'cool down'.
I would try Kempoman's experiment that he is doing. He is using a valid qigong exercise. Sounds to me like this may be what you need to alliviate your insomnia. I speak from experience on this. On the days that I have not 'cooled down' after training I will toss and turn all night long.
The reason you need to do a cool down with internal arts (or any art for that matter) is because you are putting forth extra effort in using you mind and your body at the same time. This will actually build up heat in the body, especially in the spinal column. It is good to exercises to release this excess heat, otherwise you will literally end up cooking your brain.
Another side effect would be hypertension and unchecked aggresion (i.e. road rage, etc.) Any martial arts training when done PROPERLY should leave you with peace of mind.
Btw, Lucid; what MA do you train in?