Dear- thanks for using our service, I will try to help you in your medical concern.First of all,your blood pressure is in the low range, so any change in position or movement of the head can make you dizzy and produce the blurred vision. Most likely, you need to have changes in your blood pressure medications in order to get better control. Other possibility of dizziness is a laberyntitis which is an inflammation in the inner ear which controls equilibrium, but this is less likely . Benign positional vertigo is another cause of dizziness when moves the head I hope that my advise will be helpful. Dr.Sara