Why am i so tired and grumpy

I had surgery over 2 years ago. I lost 135. But for a while now ive been very very very tired. I just feel soooo sleepy all the time. Just getting thru a work day takes alot and at my job im on my feet 8 hours. When i get home im just very mean and grumpy. I just feel to tired to even think much less cook and do all the home things. I try and take vitamins but usually i do forget. I get up at 6 every morning get my son up cook breakfast get us both dressed then we are out the door. I go to work 8 hours later im home. Im home just long enough to cook. Get a bath and then im gone to bed all before 7 or 8. Im just tired of being tired. Anyone ever been like this? What did you do? Is it because im not taking vitamins? Or paying attention to my protein intake? Deanna.... thanks in advance

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