help I have no energy and I feel tired!

I'm sure this is normal but before surgery I started the complete vitamins & was feeling real good & after surgery I've been feeling real good started taking vitamin B-12 3 times aday (1000mcg)& my tums I drink atleast a 16-20 oz of water each day & well eat eat instant grits 3x aday 1oz at ech sitting but for the past 2 days I feel so tired and don't feel like exerciseing or anything not depress just tired kinda had surgery 7-09-03 Lap RNY what can I do to snap out of this & I am still on a liquid diet but just eat cheese instant grits & sf carnation instant bf 1-2oz each morning please give me some advise Thanks.

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