I'm so sorry for your loss of your dad. Maybe you are still grieving, I think when someone is grieving they go through all sorts off emotions in all different stages. And the fact you have depression and you are planning your wedding, well that all seems a lot to me....... a bit of a heavy load to carry.
I know when I was planning my wedding, I felt a little stressed at times, and the fact I had to talk to people, didn't help either. For I find it difficult to talk to people.
You know if I was in your situation, and I knew I loved my fiance and he loved me, than I would simply tell him, that I was sorry for the words that I said to him. I think just talk to him,and tell him how you feel. Well that is what I would do. Hope this helps you some.
Take care Sarah, you will be alright.
With hugs Shelley anne