I had that same feeling shortly after surgery. And of course, I freaked out since everyone says that you won't feel hungry after having the sleeve done. It went away after I started taking a PPI.
However, six weeks out I am occasionally "hungry". It's not like the hunger I used to feel, I just feel a bit empty. And then a very small portion of something fills me right up.
Good luck. It gets better and better.
I would have to agree with Lily461. I am only three weeks out from my surgery. My doctor still has me on Protein drinks and liquids
and I am sticking to the diet. I put too much money (self-pay) and effort into making this lifestyle change. I am not about to mess it up now. Good luck with the cravings. I know they are hard to resist.