Hello @johnnyb, welcome to Connect. I was diagnosed with idiopathic small fiber PN 2 years ago but I've actually had it for well over 20 years. I just didn't pursue it because they told me up front that if it is nerve damage they can't do anything to fix it. I only have the numbness with my PN. I don't know much about HBOT therapy for PN but there is other information about the therapy on Mayo Clinic's website here:

-- https://www.mayoclinic.org/tests-procedures/hyperbaric-oxygen-therapy/about/pac-20394380

I have no medical training or background and as much hope as I think stem cell therapy holds for neuropathy I have found no evidence of successfully treating PN with stem cell therapy. There are also no clinical trials for stem cell therapy for treating neuropathy as far as I know. We had a guest speaker on stem cell treatment at the Minnesota Neuropathy Association this past August who discussed it in details. I attached my notes from the meeting along with some links to references the speaker made.

There are a lot of people making money off of those of us with neuropathy looking for the magic cure. Here are some of the sites I use when trying to verify whether something is not a scam.

Quazar's guidance about avoiding scams and snake oil cures
-- https://connect.mayoclinic.org/discussion/how-to-avoid-quacks-and-snake-oil-treatments/

FDA's Health Fraud Page
-- https://www.fda.gov/ForConsumers/ProtectYourself/HealthFraud/ucm539101.htm

NIH's National Center for Complementary and Integrative Health (NCCIH) which offers guidance about integrative health and how to evaluate it.
-- https://nccih.nih.gov/health/decisions

I take supplements which helps me but it is by no means a cure. You can read my story in an earlier post here:
-- https://connect.mayoclinic.org/discussion/anyone-here-dealing-with-peripheral-neuropathy/

Here are some member posts on Low Level Laser Therapy:

@swiss
-- https://connect.mayoclinic.org/discussion/in-search-of-relief/

@holhealthcare
Can Low-Level Laser Therapy Have An Impact For Small Fiber Neuropathy?
-- https://www.podiatrytoday.com/can-low-level-laser-therapy-treat-diabetic-peripheral-neuropathy

@johnnyb are you able to do any exercise that helps with your mobility?

John