When i read anything, i experience some kind stress in head? not able to concentrate and continue to read longer. y this happens and how to overcome?

Rule out Vision : Before looking for psych or neurological reasons, you need to rule out that there are no actual vision problems. Visual acuity issues can cause these symptoms. So can sensitivity to fluorescent lighting. If your eyesight is 20/20, try reading in natural light or incandescent. If the sx go away, use this as a guide for your reading activities. If not, an assessment by a neuropsychologist is in.