I Sprained My Leg Last Thursday While Getting Down From

I sprained my leg last Thursday while getting down from a bus.. Immediately after that I felt so dizzy and lightheaded and I fainted in the bus stop.. I reached home and was ok but still I had the dizziness.. So I consulted a doctor and after the test he told me that my bp is low and gave medicines for three days.. Today, Monday, my medicines are over, but I still feel giddiness.. I do not have any pain in my legs though.. Could you please help me..