Constant sudden dizziness when walking, BP and blood work is all normal?

19F 177cm 61kg, I take 1mg risperidone every night so, ive never had this before, but ive been feeling constantly randomly dizzy when walking, ive no clue why, it all started after I began taking my risperidone but it only started happening a week after ive been taking it, and its been getting worse. id just be walking, and then sudden wave of dizziness. today it was so bad it happened multiple times while i was walking to the hospital that I called a taxi to take me to the ER because it was that bad, the doctors at the ER dismissed me tho saying I should be here only for "real emergencies", they took my blood pressure though and its 110/81 which is technically normal. so ok I go and do a full blood count test cuz maybe its something in my blood, Nope everything is completely normal, even more normal than what my previous blood work was like a week ago when I wasnt feeling dizzy. I also did an ECG a week ago because I was having a lot of jaw pain plus strange chest sensations and my gp said the ECG is perfectly normal. another symptom I have is constant headache that doesnt go away for the past 4-5 days, it got a little better with aspirin but still hasnt went away. so im extremely confused, my BP and blood and ecg is all normal then what causes this horrible dizziness??