Welcome to HCM
We understand your concerns
You are 84 and you did not mention that you ae taking any medications for any specific conditions etc. The light headedness might happen due to so many problems such as high or lo BP, high or low blood sugar
level, low cholesterol
level etc. Some times it is possible that you are overly tired. Any how it is necessary to check your blood and body liquids for correct diagnosis. Consult your physician. Get well soon.