Severe headaches during pregnancy?

I never had headaches in my life. I'm in second trimester I've been getting severe headaches for the last couple days, my iron is normal, my blood pressure is normal too, I'm not diabetic. Did anyone else experience this? What could it be? I saw my midwife yesterday she said to take tylenol but unfortunately I didn't buy tylenol and now I'm feeling way too sick to go to store and get some, I become really dizzy too when I have crazy headaches.....