Baby Eating 24/7!!!

Stephanie • A blessed and happy wife and momma to my little man and little girl!
I had my sweet baby girl 3 weeks ago today! I've been able to breastfeed but am slowly going insane with how much clustering she does. It's been going on for about a week and I'm losing it! 
She will nurse every hour-1 1/2. She will go from 7 am- 1pm without having a nap unless it's 20 minutes and on my boob! 
I get lucky and in the afternoon get a good nap (2-3 hours) from her but then it all repeats again. Nighttime she does sleep well but she's been sleeping in my arms in a recliner. 
Is this from a spurt or is this maybe she isn't getting enough?! She does have plenty of poops and pees so I'm at a loss! 🙈 
It's becoming a struggle since I have a 16 month old son and it's hard when I nurse for hours at a time for him.