Holy Titty Twister!?

Nicole
Why are my nipples so painful and what can I do??? 
My baby is 5 weeks old and breastfeed since day 1. It's gone perfectly for us so far! Until today.... 
Last night she didn't wake up as much to eat and this morning I felt a little engorged so I also pumped.... But my nipples hurt like I've been getting a titty twister all day! It's more in my left side.... I thought after she ate and I pumped it would go away but it's been constant...... Anyone else experienced this and have suggestions. 
Ouch!!
Today is also my first day away from her so I'm pumping today