I suffer from DES. I never realized my symptoms were DES until my eye doctor diagnosed me this summer. The symptoms can be easily explained away. Presently, due to health issues, I had 10 different prescriptions that I used daily or a couple of times a week. I researched all 10 medications and found the 9 of the 10 list dry mouth or dry eyes as a side effect. Remember any medication that will caused dry mouth can also dry your eyes.
I treat my dry eyes with eye drops and an eye ointment that my doctor recommended.