@Barry *******
I have known people who have had this treatment in the USA and they also had bad reactions. You take a risk anytime you jab needles into the CNS (Central Nervous System). The pain you felt from the injections would seem to indicate you was injecting directly into the nerves.
The only symptoms I have heard of, 3rd hand, is more, long lasting, pain. But, to be fair, I wouldn't know of the good results of this treatment because people only talk about medical treatments if they go wrong.
I hope he didn't confuse what he injected you with. You did say he looked, out-of-sorts.