Nothing is "wrong" with you hun . You are just tired, like most women who have young children. You need to make arrangements with a family member, close friend or paid housekeeper to take care of the children for a weekend, so you and your husband can have a mini-vacation to renew the romance.
Maybe go with him on his next trip
This should be done periodically. If you cannot manage a weekend, one night in a motel will do. Please follow through on this. Trust me I have been married 15 years and I have to have sex everynight lol but my husband and I make time for each other needs it is never about ones needs it is about both of our needs.
It is obviously you both have some marriage problems that need to be worked out. I don't mean to pri is there another woman ?
In any case, it's time for you both to go to the next level in intercourse. A whole new way of relating.Maybe he needs to take a step back and let you seduce him.
He needs to be in support of you getting to the truth of what's going on with/between you both .
You need to talk openly about your sex life maybe try something new like phone sex with him etc it may sound strange and kinky but it might just add spark