energy down 21 days post op

I feel a little depleted throughout the day. I'm taking my vitamins. I'm eating within the range for protein and calories. Drinking all that I should. And I go for walks...building up a little more distance each day. However I still feel kind of wiped out. I know my sleep quality isn't at its best because I'm still tender from the procedure and can only manage on my back right now. Could it be sleep quality? Or could it also just be that it was a big operation and its still too early to be plum full of energy? I'm wondering if others can relate.

It took nearly 6 weeks before I started feeling like myself again.  

You've got a couple of weeks before you turn the corner!  After that, you will feel pretty good.  Couple weeks more and you'll be the energizer bunny!!

That's exactly what I was hoping to hear. Thanks!