Some distinctive symptoms of astigmatism are blurry vision accompanied with fatigue and eyestrain, but these are not the recessary result of astigmatism, you should have your eyes examined to make a definite diagnosis of your symptoms.
If you have astigmatism, you may find objects appearing blurred and distorted and images seem doubled as if they have a shadow beside it. The symptoms of astigmatism are often distortion or blurring of images at all distances, headache and fatigue and squinting.
What you have is something like the astigmatism. However, you'd better go to see an eye doctor and have it checked.
For people with astigmatism,they can't see both near and distant without squinting.They have difficulty focusing on printed words and lines.Sometimes they may have eye strain or headaches.For your case,I think it is not astigmatism.It is common if you stare at something for a long time.