I'm not sure where you are but I'm UK and use slim and save shakes. They taste quite nice but I've only managed two today. www.sns.co.uk they taste quite nice maybe give them a try. It takes me an hour to drink one though. Hope that gets better.
You've been banded the same day as me!! Hope it's going well. Sounds like you're about the same as me - drinking with ease - bit bruised though! Take care xxxxx