When will I stop being so tired?

I’m on Day 10/14 of the pre-op. I’m getting about 800 calories a day (3 shakes, half cup of cottage cheese, 1 80-cal greek yogurt, 2 ounces of meat, and 1 cup of green veggies). I’m still drinking caffeine and having trouble with energy anyway. I take b12 and 2 Fusion vitamins a day. Down 27 pounds in 6 weeks (10 in the last 10 days), which does help my spirits.

Since I feel like this now, I’m concerned what it will be like post-surgery, given general healing and even fewer calories. I’m having RNY. When did you start actually feeling more energy? Feeling normal? Feeling better than even before? I know everyone’s mileposts are different, but I feel like working toward goals would help me right now. Thank you in advance!