12 days post-op, I'm feeling weak, should I call my Doc?

I've been doing great since my surgery, then these last 2 or 3 days I've begun to have spells of feeling really weak, to the point that I have to sit down for a while. Not really dizzy, just feeling like I have to sit before I fall. Could this be from not getting enough of something? I'm getting around 64 oz of water, not feeling dried out except when I wake in the morning. I'm getting between 30-45g of protein thanks to a protein shake once a day. Could there be anything else lacking? I'm taking a chewable Centrum once a day, 1500mg of calcium a day (500 3 times a day) and biotin 2500mcg twice a day. My doc said B12 by mouth is OK with him at this stage, would that help? Thanks to everyone in advance. I've learned so much from this bunch, my surgery and early recovery have gone fantastic thanks to all of you!

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