Hi there,
I cannot comment on Poland...I have had mine done in Germany (it is where I live now). I had the op on the 4th of August 2011 and as of today i have lost 42kg. Wow, now that I write this, I am pretty amazed.
It has been hard for me as I have not had anyone to talk to about the op other than my husband (poor guy, he really is putting up with quite a lot from me).
The Dr told me that it would be possible to lose up to 70% of my excess weight within 12 months...I am beginning to believe him. I have a goal to get to 11 Stone (I am currently 20 stone).
Initially after surgery your stomach is quite bloated, this does go down, all you can do is have fluids, but this really isn't a problem (you do not want anything else)...now i am eating almost everything again but in small portions and eating slowly (or else you tend to be sick).
Having a sleeve is something that I do recommend, especially when you have tried everything else. For me I needed this, it gives you no choice...you cannot eat at all like you used to (which is a very good thing indeed!)