Sight Problem

Today my sight is really funny??
Is not blur vision, but is like the muscle of of eyes getting tired.
When i look at the thing or person. The image of them just go to a side or the image of them join together.
I tried to look away to see others things, just not to focus too much on the object for too long. So stress up with the project, every thing I did just dun goes rite.
Keep editing the slide, really feel so down when doing the slide.
I just adjust the slide by what was told to me, but it turn out that i did the wrong thing again and was qus again, why is this slide here and there?
Really dunno what to do, feel like throwing my lap top away. Feel that i am not a good leader, or i just can't give good ideas or my ideas just dun make sense or i am just stupid. I am not clever and not good at anything. Expect singing and driving.
Other than that i am not good in anything. So tired...
I feel do stupid. I can't concentrate, i tired.. but i just dunno why, i just can't be the time i am in ITE?