Hi ..it seems like some infection , sometimes post viral conjunctivitis,  you may get a picture like this . It will be better to get evaluated by doctor as you are on ATT ...anyways you should do periodic eye checks to know any side effects of ATT drugs ... Neck, shoulder pain can be related to excess computer work, bad posture .. Follow , healthy diet, lifestyle, do regular checks ... You can use moxicip kt and Refresh liquegel eye drops 3 times , but do a check.