Look, don't be alarmed or anything, but you should be worried. I had basically the same symptoms; no pink eye, irritation, etc., and it never went away. I went to see my ophtamologist and he took one look at my eyes, gasped, and said "Holy fuck...". Apparently I had level 5 micro-spider virus infection that eventually causes blindness at level 8. I had to stop wearing contacts for three months, which sucked.
He said it went away, but I can still feel the viruses gnawing at my eyes... or am I crrrazy? The first paragraph is true.