I have never been offered SANEXAS, so no, have not tried it. The laser is a warm light source designed to promote circulation, improve tissue repair, and reduce pain, a treatment called Photobiomodulation (PMB). I appreciate your question because it resulted in my looking for a reliable source of information regarding the treatment that you asked about, which in my case, is Lightforce Class IV. The website that would answer any question I could think of asking about this approach is: "Laser Therapy Medical Treatment Class IV / Lightforce Therapy Lasers."
Honestly, I don't know for certain what it is that helps me the most, but I do know that this Class IV strength of laser treatments helps enough for me to work its ongoing cost into my budget.

Do you know exactly what lazer they were using? I was going to a chiropractor for lazer treatments and after $800 could not tell any improvement. They told me they had had success with several people. I did know them personally and know they were being honest about it (in fact when I said that I did not feel any improvement, they quickly refunded the portion of the remaining session I was in. (Got taken by one in Florida-so always on guard) Wondering if the lazer you were using was the same or different?