Low Energy Level

I had LAP band surgery 8 days ago. I'm so tired and lacking in energy that I'm not able to accomplish anything in a day. I actually was able to take a walk the 3rd-5th days, but now have gotten so tired, I can't even do that. Has anyone else experienced this? Any suggestions for improvement?

I was told that Vitamin B12 (sublingual - under the tongue) is to increase your energy level.

yeah, same thing here - tired AND CRABBY all the time unless I take the vitamins, powdered vegetarian protein and B12 (I found oral B12 and am looking for oral vitamins as the kind that are hard repulse me, even if they are vegetarian.