Continuously pain in left eye since dec.

P. S I wear specs It started last year in Dec. I was applying eyeliner and by mistake it went inyo my eye.. I removed the eyeliner that went under my eye with a handkerchief, next day i experienced pain( the pain was like as somebody poked in my eye) i consulted a doctor he said its nothing and gave me eyedrop and medicine.. I used that drop for few days and felt ok and stoped using it.. After few days the pain started again ( the pain was not major but i was not comfortable with it) i consulted the same doctor and he gave me drops again.. In January after i stopped using drops it started again and i consulted another doctor he said its dryness gave me drops and suggested i should check my eye site (my eye site was .75 and .50) and he said its .50 in both eyes the pain is due to that i think, after i stopped using that the pain started again.. Its not like the pain is continuous, i experience it 3-5 times a month, sometimes its severe and i have a tiny grain in the waterline corner too