Headaches Smoking Certain Strains

Just picked up a batch from my florist, some really stinky ak-47. Thing is it gives me a dull sinus headache. Am i smoking the wrong strain? Talk to me

Some high THC Sativa's I've grown will do this if you smoke a bit much.

I bought a 1/4 of purple something from my guy and it instantly gave me a wicked head. I always like to have a few different strains on hand and the others were fine. I tried a bit of it again and same thing. So I made canna butter and ate it.

I've noticed that strains that drop my blood pressure can give me a headache... and buds from overfed, unflushed plants.