Two Years Post-Op Rny...suffering from exhaustion???

I have lost 140 pounds and with a few minor fluctuations, have kept it off so far.... saw my surgeon for an 18 month checkup in October, my labs all looked good except that I was borderline low in iron, so am now taking an iron supplement....but for the past month, have been absolutely exhausted. Find myself nodding off during meetings at work, while sitting in front of my computer, even fell asleep at a HEAVY METAL concert just before Christmas? Anyone got any ideas about what might be happening? I drink a lot of Crystal Light "Metabolism" or "Energy" - they contain caffeine.... and some chai tea, also with caffeine... but I've just got no energy at all!!!

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