"Go forth and multiply" was said twice -- and both times was when the world was empty and needed to be populated. It was never reiterated as a command for all of mankind. In fact, not having children, not even getting married, was encouraged by Paul in the New Testament. So no, I don't believe "Go forth and multiply" is a command by God to all of us. If it were so, there would not be unmarried or infertile people in the world.
You hadn't mentioned anything previously about your husband turning away from his faith. It sounded like you were heartbroken over not having more children, but it sounds like there are bigger issues at hand. Keep praying, and I pray that he'll find his way back to his faith and you'll find some peace.