**warning: what follows is totally IMHO and nothing more!!**
quite simply, no- having another baby will not 'fix you'. As you said "in my mind it just seemed at that point in our relationship it just so happens the kids came along as well. We were happier during those times and loved each other...or so we thought". Often having a child can increase the pressure of a relationship, and do you really want to bring a child into a relationship that you say is empty and loveless? You also said that you do not want another child right now. Is there anything else you can do to help bring the loving feelings back into your marriage? Is there someone who can look after the children 1x a week so that you and he can have a special date together- a child-free night with a nice romantic meal and some quality time together. That could be a start, and maybe find ways to build on the relationship from there???
Good luck, and I hope things work out for you.