I had my lap band put in exactly a week ago and my shoulders stopped hurting just two days ago. It felt like knives were piercing into them. My doctor gave me some pain meds to help. When I went to my follow up yesterday he told me besides the gas it could also be caused by the lap band rubbing against my diaphragm... He said at worst it shouldn't last for more than a month on and off.
I put either ice or heating pack to help ease the pain, this also helped me sleep at night.