Probably overconcerned indeed. If you are struck in the eye with a visible laser beam that comes anywhere close to doing damage, you WILL notice it. If it is, for example, a green laser that has only 10% of the power required to do any damage it will probably the brightest thing you have ever seen apart from looking directly into the sun (which you should not!).
Psychosomatic symptoms can feel -VERY- real though, and sometimes there are actual symptoms that you only started to notice when putting your vision under scrutiny. One example would be 'floaters' - something most people develop slowly with age and normally not care about. One you start looking at for any defects in your vision you will probably notice you have them when looking at an evenly blue sky etc.
Of course another thing could be some eye ailment that is completely unrelated to lasers, but is actually serious. One example would be cataracts that just develop regardless of laser use, are not made worse by it either, but will impair your vision over time. There is very good surgery to deal with the problem, and many people have it done later in life, but for some it sets in at a relatively young age.
If you believe there is something wrong with your vision have it examined. This examination is normally non-invasive and give you either peace of mind, or a diagnosis for a problem that should be treated even if completely unrelated to laser use. Obviously these things to cost money, but aren't tremendously expensive if you don't have insurance that covers it.