You have sustained a minor head injury
a month back but, fortunately, there was no severe repercussion. Getting your eyes evaluated by an ophthalmologist to ensure no damage to the retina inside the eye was a sensible decision as well. When astigmatism
is diagnosed, it means the eye has a refractive error
in only one meridian. Hence, things like a point source of light, letters like H and N look really distorted. Light, particularly, seems 'streak-like' in nature and the glare is particularly debilitating. You already have a myopic refractive error of -7D so that is probably worsening your situation. Uncorrected refractive errors or inadequately corrected ones particularluycylindrical errors (astigmatism) can cause dizziness
, objects appearing tilted, nausea, constant headaches ,eye ache and blurred vision
such that, after a while, it seems to remain constant. You have a history of migraine that can be aggravated with this scenario. Please have your refractive error checked and wear the right spectacle prescription all the time. Try a little rest for a couple of days and use ice packs on your eyes as well. Most problems associated with an uncorrected astigmatism disappear in a week at the most.