I used to a lot, but not too often now. It is called 'sicca' syndrome. Sometimes people with Fibromyalgia also have the co-morbid condition called Sjogren's which is a serious auto-immune disease which has as one of the symptoms (dry eyes and dry mouth, etccc)
Have you had your ANA, sedrate, etc...checked?

Yes I do that and allergies both! Eye droos galore!

So do I it’s horrible I use lubricating eye drops

Some times I do, mine ache bad! Open or shut more than being gritty.
Trevor I hate fibromyalgia too, it's took and is still taking so much from me and my kids but.... I give thanks everyday that it's only fibromyalgia that i have because there are so many people and especially children, that are suffering with much worse diseases or conditions. I really wish and hope for you that you find something to help with symptoms so that you have a better quality of life ❤️

Yes