Hi, am a 68 year old female and about 3 times a week I lose energy, very tired, little dizzy afraid to drive the car. I currently take high blood pressure medicine for over 10 years and cholestrial pills. Doctor has ran every test to include blood work. Nothing found yet. What other explanation do you have. I walk 3 miles a day (morning) and some days great and others all of a sudden, no energy. Lost weight (was 168 now 145) even though i each a light breakfast, lunch and dinner. Help with suggestions