Maybe it is not a blind spot. A blind spot is also called scotoma. People with a blind spot means s/he has an area on the retinal that have no receptors to respond to light. And I read online that everyone has a natural blind spot or physiological blind spot in their vision. And you suffer a blind sport in these days may caused by other factors such as tiredness or migraine etc. Youâ€™d netter have your eye checked by a doctor.
According to what you described, you may get a migraine. Personally, I think it may have something to do with your blood pressure. You may don' t know, high blood pressure can usually cause this symptom. But we also can' t exclude other factors. I think the most effective way for you is to go to a good eye doctor to have your eyes checked carefully. You will absolutely not go blind, please don' t worry too much.