I am experiencing fatigue and lightheadedness (worsened by: prolonged standing). The following also describes me: Rapid heart rate. What should I...

A lot more. information is needed to put forth a reasonable explanation for your symptoms....for example how much salt (sodium) do you consume a day? What is your general nutrition. ??Do you eat enough protein?? Suggest a HealthTap Prime Consultation. Hope this is helpful Dr Z.

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I am experiencing lightheadedness, fatigue and dizziness (better by: with fluids, rest) (worsened by: hot weather, sitting upright, prolonged standing). The following also describes me: Rapid heart rate. What should I do?

Hydration. You may not be drinking enough water. Drink enough water daily so that your urine is mostly colorless.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex.
Get HPV vaccine. Read more...

50 years old very tired rapid heart rate, sometimes dizzy while standing lightheaded, very emotional, second menstral of the month.

Are you anemic? A simple blood test (CBC) will determine if you are anemic (especially if you have had more menstrual bleeding than usual of late...). Anemia can cause most of these symptoms. Thyroid hormone level disturbance can look like this as well--another simple blood test your doctor can order. Read more...