@lauren915 - Welcome to Mayo Connect! You are right- there are a lot of members here with gallbladder experience.
I lost mine too years ago. I remember having similar problem as you describe. With the combination of back pain and shortness of breath I recommend that you call the doctor’s office tomorrow. The back pain relates to the nerves around bile duct. Your surgery was so recent it is difficult to be relaxed about it.
Please get back to us after you talked to the doctor’s office!