Donna, have you checked your blood pressure at these times? The atmospheric pressure drops when there is rainy weather and storms. Many people are affected by it... it can also increase joint pains - arthritis, arthrosis and old injuries. Some could be the humidity but i think a lot is caused by the change in atmospheric pressure. And i'm wondering if it could cause a subtle drop in your blood pressure - that would make you feel tired.

just an idea

~ waves ~