Hi Kelly
Everything you are feeling is normal. You have come to a great place for support, so many of us have been through the same thing, some worse. You will get through this but you just have to allow yourself to grieve. Your Fiance will grieve very differently to you but you need to keep the lines of communication open with each other. Let him know how you are feeling and encourage him to let you know how he is feeling. It is a tough road.
Make sure you look after yourself and take comfort in this wonderful place BB. We are all here to help and make you realise that you are normal.