cmmoreau

it's mostly likely from the IV fluids they gave you in the hospital. It's basically salt water, which a lot of people retain. I've heard of people leaving the hospital weighing up to 10 lbs more than when they went in! It does take a few days to work it's way out of your system, so hang on. You should start dropping weight very soon.
as for protein shakes, I never had trouble with drinking things from day 1. I was worried about it because we were told we'd only be able to drink a little at a time, but the PA at my clinic told me not to worry about it - that my stomach would tell me if I was drinking too fast or too much.

Ditto with all the comments above. How many calories are you taking in daily?

I, too, had no issues drinking, and I also had a lot of water weight gain due to the IV for a few weeks. It is normal.

I panicked when I didn’t lose weight the first week too. I had a hard time with any fluids the first few days and wasn’t really able to drink much of the protein until the 5th day. You can sip on it. Do try to get it down in 15 min. In the beginning the water was more important and with so so little hydration I mostly survived on rehydration, zero Gatorade. The 5th day post op I was able to get more of the protein in. The isoprene clear protein mix was a box help with that. Not nearly as thick and rich as the premier type shakes.

I meant, don’t try to force it down in 15 min. I had to sip on mine for about an hour at first.

I came home from hospital after my sleeve 3kg heavier due to a lot of fluid retention. It's quite normal.

I agree with @SpartanMaker. It’s not uncommon for people to see no loss or even a gain after surgery because of the gas & fluids they pump into you. Some surgeons even say don’t weight yourself for a couple of weeks after surgery.
I remember I weighed a good 2kgs more 48hrs after my gall was removed & I’d barely eaten. Was just bloated.
For a lot of us who struggle with the shakes after surgery it’s because the taste & texture change to us & become unpalatable. Plus I wasn’t at all hungry or interested in food.
PS - Congrats on your surgery.

it's not that unusual to see similar results. You are likely just retaining fluid post-surgery (very common), which could mask any fat loss.
Give yourself time and try not to stress. The weight loss will come.