sex drive

before I had my first child I was horny all the time, after I had her I totally lost it. I was never really interested in sex. it really bothered me for almost 8 years then i had my second. all of a sudden my sex drive came back and then some. If I dont have sex/ please myself three+ times a day I get super bitchy. even if I orgasm I'm back to needing sex right when im done. yesterday was sex 5 times and my toy once plus I gave him a bj as well. what the hell is wrong with me and why cant I not be horny ever. my husband doesnt mind but he works 60 hours of physical labor a week so he can't give it to me as much as I need it and I cant keep waking him up twice a night to have sex