I can't answer the question the way you put it cos I have not done the TP injections. I have had hands on work but it was only one session. I also have had Needle EMG (Electromyography) where they tested me with a small, thin needle into several muscles to see if there are any problems.
* My hands on session hurt at the time but it was tolerable and I felt marginally better the next day.
* The needle EMG hurt terribly in one particular location and I got nauseous immediatley. It also was fine the next day.

I'm just sharing my limited experiences with needles and massage. I am waiting for WC $ to come thru so I can do more massage therapy. I have a feeling the physical manipulation is a more of a long term solution, more gentle & natural too. I may be wrong...
Let us know what you try!!