baby weight

Anyone else struggling? 
Before being pregnant I was a petite 119lb and today I'm 170lb. 
I delivered at 172, got down to 148 at 6 weeks then had the Mirena put it and ballooned back up.
I'm so frustrated. My daughter doesn't sleep through the night yet so getting up early to work out is not do able for me right now. I eat well. I breast feed. 
I don't know what I'm doing wrong but I'm literally distrusted at the sight of myself. 
Any tips? :(