I’m so sorry you are suffering so badly. I don’t know if this will help or not, but my eye doctor gave me an eye drop called Ivizia, they are natural without preservatives and they are the only eye drop that doesn’t make my eyes feel worse than before I used them. They are over the counter. I have several food sensitivities and also suffer from loss of taste/smell for 2 years (2 years ago today) from Covid. The drops help relieve my dry eyes and I find that I don’t need to use them every day. It’s just something I thought might help you. Good luck!