I am 34 and feel entirely too young to offer marriage advise, but the fact is I am very happily married, so maybe my $.02 will help.
A little background. I have been with my DH for 19 years, married almost 17. He is my one true love. I fell in love with him, despite me not wanting to, when I was 15. We got engaged when I was 16, married at 17, pregnant with our oldest DD at 18 and had her at 19.
The best advise I can give you is to date your husband, OFTEN! DH and I date at least once a week. Your kids are old enough to not need to pay a babysitter. Even when we don't have much money, a cheap date is better then no date. We have had some very cheap dates (a walk for an ice cream) and they are just as benificial as a nice night out. We meet a couple times a month for lunch, go out every weekend, and sometimes we just go grocery shopping together and get a drink and sit in the cafe at the store before we shop and talk. I can't imagine my life and surviving the stress of 3 kids if I didn't have those times to look forward to. That would be my #1 piece of advise. DATE, DATE, DATE, and remember why you fell in love.
Also, I have found when I do little things for my DH it comes bask to me (not why I do it, but it's nice!) Some little things I do for my DH is I make him breakfast every morning, I put love notes in his lunch, I stop by his office and make a heart out of Hershey Kisses on his dash (I do this all the time, but not in the summer, learned that lesson on a warm Spring day!) I send him cards at work just because, I write love messages on his window of his car. Any little thing to let him know you love him. It becomes fun to think of what you can do next and despite him being a big, strong man, it makes him smile to know I cared, and then he does little things back and it becomes a little game of "love you tag."
I think if you remind yourself what it was that you fell in love with him for and get back to that, while you may not have that same new love feeling, you can have a truly wonderful, comfortable love which to me, is far more enjoyable.
Best of luck, I hope you can fall in love with your DH again. Getting married at 17 I learned the ups and downs of marriage. We went thought them but we are so much stronger for it and I have never loved my DH more in my life and I know tomorrow I will love him just a little more. I wish that for you as well.