Strange feeling in left eye. My eye.

My glasses broke down some time back so I wore my old galsses as there was only change of axis and rest number was same , but I suddenly started feeling strange in my left eye , I ignored and wore that specks for 2-3 months , once I had my new speck ,this problem was gone immediately but now again I am having the same problem with my left eye ,it's like I can actually feel my eye , can also sometime feel little heaviness and very mild pain on the upper side of eye (near to eye lids). Even when I maintain focus on something , after few mins I again start feeling my eye and I feel like I am loosing my focus. I checked with doctor 3 months back , he did not found any problem and gave me lubricant drops, I am using currently refresh tears as I have problem of dry eyes . I want to know what can be possibly the issue with my eye.