Lifeasaking, 1stly, welcome to the forum, 2ndly, I think you're here because you need help. 3rdly, " don't hide your light" let it shine, if your husband to be is as much an atheist as you say, do you think he will be happy with you when he finds out you're a christian. Can I boldly say, "DON'T MARRY HIM." We have other folk on this forum who have/are in the same place as you, and ARE PAYING THE PRICE FOR IT." The Bible tells us very plainly, "DO NOT BE UNEQUALLY YOKED WITH AN UNBELIEVER." 2 Cor 6:14. It sounds harsh,I know, but take it from me, you'll be saving yourself from a lot of heartache, this is a time to listen to your head, not your heart/ emotions. Please feel free to ask questions, people here will be praying for your health issues, this pressure of getting married while in this place of discomfort/pain, should not happen, just saying. Hoping that this is helpful, and as always, God bless.
P.S. If you follow this advice then I'm sure the you will live up to the name you have chosen, life as a king, for you will be a real child of The King.