I'm having my surgery on the 21st but I've had a LOT of surgeries before, so I can chip in on those questions. It's actually really surreal. Surgeries and anesthesia really differs. Sometimes you'll be in and out in a blink of an eye and sometimes you'll have vivid dreams or hallucinations. The most important thing is either way, you'll be without feeling and you'll be off in your own world if just for a minute or what feels like a lifetime. For example, I had a major urologic reconstruction in 2008. It was an 18 hour surgery. It felt like I was down for...5 minutes? I had my kidney transplant in 2013 and felt like I was down for hours, and it was probably my only "freaky" surgery experience in that, and this is hard to explain, but it felt like as the nurse was talking to me it just stopped being talking and it started being a droning that circled around me.
As far as recovery pain, I can't give WLS exacts, but for most surgeries it's painful. BUT you're lucky for the first few days you'll have a PCA (patient controlled analgesia) pump to use at your leisure when it begins to hurt. That's for the first few hours or days (depending on the surgery) so your body can recoop a little bit. After they cut you off, though, it'll hurt but laparoscopic surgery usually isn't too terrible. I'm not going to sugar coat it and say it won't hurt, because it will, but you should be given stuff to help and it usually gets better and becomes more of an irritant than a pain after a few days.