Sounds like you have adrenal gland problems which is a cause to have low blood pressure and do not think stevia has anything to do with it. I have used stevia for years in my one coffee a day but coffee is a no no if you have adrenal gland problems. Go to the adrenal cure zone site. Most doctors do not recognize adrenal gland problems. You will find all the symptoms on the site and dizziness is one of them as is fatigue.