My eyes randomly cross inwards and put me in a sort of trance that usually lasts about 5-10 seconds. why is this? what can i do to manage it?

Many possibilities..: It's hard to say without a more extensive history what this is exactly. However, more commonly your eyes can strain and become fatigued with prolonged time in front of a computer/TV, new glasses needed, lack of sleep, contacts in too long, headaches, and the list can go on. Check with your doctor to make sure a more specific cause can be derived with a better patient history intake and exam.