I can't speak to the PN part of it, but my chiro uses LLLT when needed for my shoulder, neck, elbows, foot -Plantar fasciitis, low back..
sometimes I only need 1 tx with it and sometimes again at the next appt.

But usually the sore spots (chronic RSI & misc other pain) go away instantly after the LLLT. They may eventually come back due to activities but that's life sometimes.

I wish I had on of my own.

But you don't need to go to a special treatment center, many chiros and some PT places have LLLT , just call and ask them about it and if they have experience with treating PN.