...is this:

Gel

I have used it for years. As does Dh, and Ds.

My neck is very bad.

It is expensive, relatively speaking, but lasts a long time. You only need a pea sized bit on the spot.

The spray doesn't work for me as well as the gel. I definitely recommend the gel version.

In it are:

Cypress
Wintergreen
Organic Helichrysum Hydrosol
Himalayan Salt
Organic Sclerotium Gum
Magnesium Chloride

My feeling is that the wintergreen, which is aspirin-like, the helichrysum, and the magnesium, are the keys, but the mushroom may help, as that's the difference between the liquid and gel.

Anyway, with your continuing problem, it seems like something worth having on-hand, perhaps.

I wouldn't be able to sleep for the pain many nights, if I didn't use it right before bed.

Definitely prayers and healing thoughts.