Healthy eater only water. why does my bp spike every couple of days & sometime bp is normal & heart rate is in the 90's. could this be anxiety?

Can be anxiety, but: You need a full medical evaluation of this problem to be sure. You also list "headache, pain, dizziness" in your clinical findings -- and they may be connected with your blood pressure changes. BP and pulse can vary, as these respond to activity level. If associated with symptoms, they need investigation. Please start by seeing your family physician.