I do not have a good answer for you. I work for an optometrist, and for my burning eyes, he recommends Systane Ultra. I use Refresh Liquigel with better results, although neither truly take away the burning for any amount of time. On my worst days, I have to use it every 1/2 hour or so for any kind of comfort. Yes, he did say I can use it as often as needed.

He never mentioned to me it could be nerve related. His answer is, allergies, hormonal, or autoimmune. He thinks mine is hormonal, but I think it's autoimmune. Since I do not have an official diagnosis of celiac disease, he feels it's hormonal.

I feel for you, between my burning eyes, and constant tinnitis, some days are very uncomfortable.