M.D.
My heart goes out to you DJ,
I know this is hard for you and your husband on many levels, and you are in my prayers. As for your little 4 year old, I think you should tell him the truth. That you are going to the hospital to have a procedure done so that some day he'll have a little sister or brother. Tell him you may be sick from the procedure but you'll be fine in a few days. Let him know you may also be a little sad, but let him know how much you LOVE him. If you want to go a little further and let him know what's going on with you a friend of mine had the same thing happen, and the doctor said it's like all the lights are on in the house but no one is there. Then you can add that one day his little sister or brother will be in the house. Kids are so smart, they don't need all the details, they do need to know how important they are. They need to know that their mommy and daddy is okay, because they do worry about us too.
May God Bless your family and give you the peace that passes all understanding, the trials we go through make us stronger and God has a plan for your life and your family. Lean on him!
God Bless You!