My hubby use to call me "Mother ship" cause my boy was always "docked" or "docking". It did seem like the first 2 months or so he was always attached to me... he ate about every 1 1/2 - 2 hours during the day & nursing sections lasted about 15-20 per side (30-40 min total). So, I really didn't get much done during the day & forget going anywhere. I did start giving him a bottle if we did have to go somewhere, which never affected him nursing or my supply.
As to pain - if his demand went up, sometime it would cause me to be a little more painful. But I also had a few clogged ducts w/ him and man oh man can they be painful. I'm not sure what kind of pain you are dealing with. Also, sometime if he sucked me dry it would hurt as well... cause he kept sucking & nothing was coming out.
I did look up increasing milk supply and one thing they said to do is ate oatmeal... I was suprised to find out that it does help. So, I don't know if that would be helpful or not... if she is sucking you dry it might. Which could be another reason she seem hungry all the time.
Good luck w/ the nursing!!! It can be very hard, but is well worth the effort.