I had to have my gall bladder removed, around a year ago. My excess skin caused problems and I had severe blood loss during the op. 
 
Post op I had no problems and It didn't really affect my weight.
 
Strangely though I sometimes still get pain in the same place as where my gall bladder was, my mother in-law also gets the same pain even though her gall bladders been removed too.  Very Odd indeed.