I haven't had sex for 8 months.

So I've been with my SO for 6 years. We've always had a great sex life. Ever since I had my daughter (November 16,2014) my sex drive has been pretty much nonexistent. It's not that I'm not attracted to him bc I so am. But i just don't ever want it. I work 50+ hours a week and our daughter is still cosleepiing with us and I still breastfeed at night. We are living with my mother in law while our new house is being renovated. I feel like we never have time for just the two of us. Some days I'll be excited to go home and want to jump his bones then I'll get home and be so exhausted from work then I'll have to cook dinner and clean and do laundry. I'm so beat that most of the time I fall asleep as soon as I lay down. I'm not making excuses for not having sex with him but my grandma, who raised me passed away in December 2015. It's been so hard without her. I just don't know what I can do to snap myself out of this and get my sex life back. It's caused a strain in our relationship and I know he has needs. Is this normal? What should I do?