So am one week post op and when I drink water in a gulp I feel it going down my esophagus and I feel pain till it finally hits my stomach,is that normal ? And will it ever go away ?

That's normal and it's your system telling you to slow down the drinking.

You need to take smaller sips. I am just over one week out. I can take bigger sips than right after surgery, but I still can't gulp water. Your surgery center should have told you about this. It gets better but you likely will not be able to "guzzle" water anymore.