Do you get enough fluids? Is your body still able to absorb the electrolytes it needs? When I got older the answers to both of those questions was, NO. I have a problem drinking enough water to stay properly hydrated. Then all of a sudden I get dizzy. Also did they check your Vitamin D-3 level. I was sometimes unable to bend over and come back up without questioning if I was going to pass out. One time, I was bent over and when I stood up I started walking sideways and couldn't stop myself. Since I was on a 2nd tier in my yard with a 3-4 foot drop off, I reached out to try to catch myself on the big oak tree. This was the way my Dad walked when he had a stroke and it scared the devil out of me. I switched doctors and she checked my D-3 level. I'm outside in the sunshine working and walking all the time, but somewhere in my 60's evidently my body no longer absorbed that sunshine vitamin from the sunshine. She put me on 10,000 IU's of Vitamin D-3 daily. When she ran the blood test it registered as "severely low" and taking 10,000 IU's daily took over a year to bring that level up to normal. D-3 also helps to regulate blood pressure and mine was all over the place and the constant drops and increases and the dehydration of my system was causing bouts of vertigo. I have to drink a big bottle of "electrolyte infused water" or Gatorade if I am working outside, or if I haven't been drinking enough. Those electrolytes wreak havoc in our systems if they are low, and I never miss taking my D-3.