Where is feeling of jet lag, weakness, fatigue coming from?

For 3 weeks, I have been feeling very low energy. I have 8.5 post op, age 64. I exercise on treadmill twice a day. The feeling reminds me of jet lag. I do have sleep apnea, but use a machine to help regulate breathing - last 15 years. I've lost 86 lbs with 15 more to go. My protein is 80g (in combination liquid and solids) and drink 70 oz of water each day. My labs showed no abnormalities. Still weak. Take all bariatric supplements I am to take. I have an appointment next week to see pcp. Coming to the boards have helped me so any comments would be appreciated.

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