I'm over pumping

Kirsty
Can I vent for a second ladies? My daughter is almost 6 months old and we exclusively breastfeed. I'm really proud of this because I didn't even make it 2 weeks with my first child. I love the bond with my baby, and love even more how healthy and chunky she is - especially in comparison to my son who was thin and sick quite often. However... I'm so sick of pumping. I work full time so I'm pumping at least three times a day to keep up with the 18-24 oz per day that she's drinking while I'm at work. My breasts are in a constant state of soreness. I've almost run through my frozen stash and have no hope of rebuilding it. 
Does anyone have suggestions on keeping this up?