Does anyone have experience of this type of pain relief? I have been waiting since January and finally been given an appointment for this on Monday and i am suddenly nervous. I don't really know what to expect or if i have to prepare in any way. Will it affect any other pain medication I'm on? Will it wipe me out for the rest of the day? Will it work immediately or do i need a few session before it helps? Is it a short term or long term solution?