You don't need permission from us!
You are fighting so much harder than all those moms out there who fall back on formula the minute there's a little problem. Baby needs a mommy who's not too stressed out to give her the love and attention she needs, which is so important! If taking a little break will help you, then you do what you have to do. Every bit of breastmilk she gets will help, even if it's only a little. Maybe taking a break from the struggles will help you both get back on track.