Spiritual way is a way to better work with our subconsciousness because of better state of consciousness and better life. Energetic system of body is something controlled by subconsciousness, but if we are improving our psychic abilities, we can work with similar systems consciously. After an AP your energetic system is mostly obviously working. Pain is only effect of wrong working with this systems - mostly it is concentrating consciousness to something too concretely, spiritual methods of working with psychic states is based on "abstract concentrating". It is something very easy. It became to people I know only once, after some time it spontaneously become better. Subconsciousness almost always make it better quickly and precisely, I think pain is something, what can happen only if you are beginning. I don´t know how long you are interested in AP etc.