I've had similar symptoms from similar meds. Low blood pressure may be a large part of the dizziness issue. It sure makes for unsteady footing, etc., and has caused me some bike scratches.
Quoted from:
http://benicar.drugs.com/"Possible side effects of Benicar :
Abdominal/stomach pain; cough; diarrhea; dizziness; headache; unusual tiredness."
