Claire, hold up sweetheart. You are two weeks post op. Your body has had major trauma, your innards have been replumbed. You have to be patient with your body and give yourself a lot more praise for what you are overcoming....
Our provider has us on 4 weeks fluids, 4 weeks puree then slowly incorporating solids such as chicken so i think you are doing pretty well.....
If i was you and your pouch is hurting then do as someone else said and go back a stage for a couple of days. Why not try some really well pureed stews if you feel you need food.
As for the drinking, there have been times for me 8 months post op when i've eaten too much and i physically cannot drink for a while, never mind getting one in 30 minutes after food. Luckily we learn this lesson and it doesn't happen often
As the others say, your only just coming up to two weeks post op and it sounds like you are doing fine....
If you feel thirsty and can't manage to drink after food (30 minutes) then why not get some sugar free ice lols (tip tops even) because its amazing how one of those can rehyrdrate your mouth after spending a bit of time sucking it....
As for the weight loss, you have scared the crap out of your body losing so much weight so quickly. It's holding onto your reserves but once it realises the food will still come it will let go again soon...be patient!
Keep your chin up girl, i think you are doing fabulously xx