Suggest Treatment For Constant Fatigue While Treating High Blood Pressure

Constant fatigue. Even following 8+ hours of sleep. I stay hydrated, I speed walk the lake (3.5 miles) regularly, 4-5 days a week. I eat well, few fried foods, lots of salmon, salads and at least 16 ounces of water per day. I have high blood pressure and take three meds (in a very low dosage). Am 55 and ~150 lbs, and have been absent minded the last few days (e.g.- put my keys away before I lock my car door. I put the keys away before I open the trunk to grab my work-out bag, despite standing next to the trunk in order to grab my workout bag). Help!