starting to see cards that aren't there??

[TheRedRocket]

I just got stacked off because on a 6q4 flop I got it all in with 33 the problem being that when I looked at my hand I saw 66, multiple times!!! it wasnt until I realized I was sitting out that I went back to the hh and was like WTF. earlier in the same session I saw AK on a AKx flop when I really has AQ. now let me make this really clear I am looking at my cards and literally seeing something that isnt there, its not a case of just not paying attention. this has happened in the recent past as well and im kind of freaking out.

has this happened to anyone else? thoughts on the cause? I multitable but dont play long sessions