Like "Howdy MrsW Feeling weak could come from a number of reasons. When one's Blood Glucose (BG) levels are low (hypo) you could feel weak. I feel weak because of my Chronic Kidney disease (CKD) is acting up and I NEED dialysis! One could have anemia, which is another cause of weakness. There is a whole laundry list of things which could bring on weakness and a tired feeling. Some of them trivial, others could be the start of something deadly serious. I would recommend you tell your Dr about it and tell Dr when you feel weak and under what conditions, and let Dr figure it out for you. That is what they're there for! Praying God's richest blessing be upon you and yours! James Baker"