I'm feeling weak all the time!

It's been two weeks since my surgery,I was really starting to feel great until three days ago when my legs started feeling weak and I threw up for the first time.Now I am feeling hungry but when I eat I feel worse.I'm eating regularly and lots of protien,but always feel like I've got low blood sugar. My doc doesnt seem to worried.How can I get over feeling like this? HELP

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