I'm about 3 weeks post op, I started going to work middle of last week. Even though I'm just a nanny the stairs at work kill me, plus the lifting. Its always on the same side as the lapband right under the rib cage. I think its more the stairs at work, I live on a one story house and do not have a problem. It feels like I have a pulled muscle, I did not know if they cut into the ab muscles when they do this surgery, and if it was torn due to that. I have gotten to the point I'm just sick of this pain but I'm only going to work because I need the money. Is this pain normal? How much longer till it subsides?

Yes, the pain is totally normal, and it'll eventually go away. The port is sutured or hooked into your abdominal wall, so you'll feel it when you bend, lift, twist, etc.