I don't think you're crazy, Carol. Though you may be suffering more than necessary. Thank Mother Nature for designing women with a yen for babies. It's built into our systems, from hormones to body to brain. And historically necessary for the survival of the species, considering all the disease, famine, war, and other catastrophes humanity is subject to.
But unlike other creatures, humans have the ability to override natural impulses by using reason to make other choices. Human population is growing at an alarming rate. Now that we are such a successful species that we are polluting the planet, crowding out other creatures, and even threatening the climate that all life has adapted to, it's time to place a higher value on our ability to make rational choices. That shift in focus can make a difference.
It is possible to stop suffering over this, Carol, if your focus in on cultivating peace and happiness and investing yourself fully in the blessings you already have (I say this as a woman who adores infants, but stopped with one child of my own). Since your husband isn't subject to the hormonal longings you are feeling (and part of that is that you have given birth), he's already in rational mode. So you apparently have other good reasons not to have a child – the long-term success of your family unit, for example.
You might put your love of children to good use by getting a job working with children or babies. Even volunteer work. There are babies born with drug habits whose little lives you could improve by being available to hold and rock them, for example.
I wish you the best. The feelings you have are somewhat like physical hunger. Just because we feel hungry doesn't mean we can eat everything we crave. What we want may be unavailable, it may be unhealthy, it may simply be too much. Think about how you calm your physical appetites to assuage suffering, and translate that approach to the baby hungries.
