She won't stop eating!

Shailea
My baby is one month old and for the past couple days, I swear I've been nursing her nonstop. She's been pretty fussy and it seems like the only thing that calms her down is eating. She's been going for 20 min on each side and sometimes longer. And when the 20 min is up, she doesn't seem to be "milk drunk" and tired like she normally is. When we get close to the 20 min mark, she starts bucking like she wants off but then she wants right back on. I'm worried that she's not getting enough milk but I'm also worried that she's eating way too much. It's also pretty exhausting for me. Any thoughts or suggestions?