It seems that you are a regular computer user if so it might be computer vision syndrome. Please use lubricant eye drops e.g. teardrop 3to4 times daily and rub ocupol dx eye oint to be rubbed twice daily on lids
Next Steps
Follow 20.20.formula ie close your eyes for 20 seconds after every 20.minutes. keep proper distance between eyes and screen ie approx 20.to 24 inches.wash your eyes with freshwater frequently and also do cold compresses with ice. don't sit facing towards ac or blowers and do cold compresses with ice also consume lot of fresh fruit and vegetables.