I feel for you
@Lainie71. Any inflammation of the delicate tissues in your nasal passages and mouth is particularly painful.
As a young man, my husband (who is not diabetic) suffered frequent sinus headaches made worse by high humidity. The one factor that eased his symptoms was a drier climate; hard to come by anywhere in the British Isles!
In later life he is much better and puts the improvement down to our way of eating, that is lots of fish, seafood, a wide selection of vegetables and no red meat or ultra processed foods.