Baby doesn't stop eating 😢

My girl was born 8/15/2016 she was having a hard time with breastfeeding at the hospital but we kept practicing and we got it💪🏼 she was eating every 2-3 hours 
now for the past 2-3 days she's been up all day eating she doesn't sleep more than 10-15 mins the most 30 mins and is up to eat only plus is she has one longer stretches of sleep at night  then she's up at it around 4-5-6AM
 She having enough wet and dirty diapers I can't say she isn't getting enough but that's just what it seems like that she isn't getting enough breast milk . I gave in and supplemented formula even with 2oz of that she still doesn't seem full I also offered a paci and she's just sucking her life away then just screams .
I'm so frustrated I can't get anything done around the house I have 3 other kids 
getting my kids to school is near impossible 
I'm so overwhelmed 
Is their end in sight ?
Is Something wrong with her? 
Can. It be my milk supply ? 
Any of you ladies with babies her age going thru the same ?
Please give me some encouraging advice ?