well 1st of all, visine usually worsens most inflammatory conditions. if you are or have been a frequent visine user in the past, that could be part of the problem.
if it is an inflammatory condition, yes steroids are the usual and standard course of treatment.
i would not say that this is 'definitely connected' to any one time event or bout of flu. pretty unlikely, even if you think thats the case.
never a bad idea to get a second opinion.