the two week thing is the infamous "three week stall". Almost everyone experiences it. Here are the 17,501 posts on it on this site (and no, I am NOT kidding):
https://www.bariatricpal.com/search/?q=three week stall
weird color poop isn't uncommon the first month or two after surgery. I think paleness usually indicates fat malabsorption, which isn't a huge surprise. I think mine was normal colored after about the first month.
as for the pain thing, I'd run that by your clinic. I'm not sure what that is- could be a lot of things, I think. They might want to do a scope or something to see what's going on.
