Spiritual energy is powerful. If you do not feel anything after one or two sessions, it's probably because the practitioner's work. How long has it been? Have emotions come up for you? Do you feel clearer? Lighter? Foggier? Pain? Diminished pain?
It is very important to ask your practitioner before a session-
1. Where are they channeling the energy from?
2. What are their goals?
3. Where did they learn these practices?
Every practitioner works on a different plane of consciousness, therefore some practitioners are way more powerful than others based on their level of Soul initiations, consciousness and practices in this life.
Even if a practitioner is working on your etheric layers, you will feel it in the physical consciousness. This is the laws of physics and goes back to spiritual scientific teachings.