more serious note you could well be run down, 2 years ago I was signed off for depression ( not suggesting you are) but in the run up to that I had 4 recurrences of cold sore, 2 bouts of tonsilitis and 3 colds. I have had nothing in over year now. If your body is feeling under par that's what happens, are you physical trying to do too much?
I have to say I would have thought the same, the only thing I can think of is if your eye is unable to maintain a steady focus on what ever object you are looking at. Definitely time to visit your optician Stickless.
As an aside I hope otherwise things are not too bad. Like yourself it's a while since I have posted, but I do keep an eye on old friends in the blue room.