Your question implies there is no other explanation for your skin turning warm and flushed, typical if the blood vessels are relaxed, and later cool, expected if they returned to normal by way of contrast or were contracted reducing surface blood flow. You also say 'it worked', but have no measure of what working means. So you got warm and then cool; is that all you require to consider the herbs did their job? How do you tell cleansed Chi from dirty Chi? How do you know they did anything beyond making you feel warm and cool, which in itself is a subjective assessment?

I'm not a doctor, so others may have a medical opinion, but I will say that there are likely other explanations for the effects you see that have nothing to do with mysterious life forces and everything to do with the physiology of your body and the actions of various chemicals contained in the herbs you consumed. I certainly doubt that they clean lymph nodes, and if all your body heat was removed you would be dead.

If you list the herbs, then that would allow a more in-depth analysis, but failing that you should assume the answer that fits with existing knowledge of biology and medicine versus an answer that requires invisible life forces.