High heartrate + Headaches

Hi - I was wondering if anyone had any advice here. As the title says, I get very frequent headaches, ranging in severity from annoying to debilitating, and my heartrate is often somewhere near 150 even when sitting or walking gently. I am 18 and there is no family history of any of this thus far. Is this an autism relating thing coming from overstimulation? Any advice would be much appreciated.