Hello and thanks for your question.
I'm sorry you're feeling miserable. Is the vision back to normal or is it still affected in the left eye today?
Has the eye been red, sensitive to light or had any discharge coming from it?
It sounds as though you are having a viral syndrome. That would explain your fever, headache, sneezing and sinus pain. This can affect the eye in the form of a viral conjunctivitis (aka pink eye). Usually the symptoms reach a peak in one eye and then cross over into the other eye.
Usually, because it is a virus that causes these symptoms, no antibiotic will change the course of this and the virus just has to run its course. Occasionally, the inflammatory response in the eye will ramp up significantly enough that a steroid is needed to calm the signs and symptoms.
I would recommend to continue taking the cold medicine, ibuprofen may help with the pain. But I would recommend using cool compresses instead of warm, continue using artificial tears and if the pain and symptoms continue to worsen over the next 24 hours, you should consider seeing an ophthalmologist as you may require prescription medicine to help.
Does this help address your concerns?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.