Irritation, panicstricken. Help me!

I have my marriage in 6 months and everytime I am worrying about it so much that it is really creating a problem in my every day life. My fiancé stays in a different city due to his work and in most days we end up fighting due to my anxiety. I always feel as if something wrong will happen, things won't fall in place and so end up asking him hundreds of questions, keep on taking his assurance that there will be no problem from his family and everything will happen smoothly. It is affecting him and our relationship. I get cranky, confused, feel lost and also irritating. This is affecting my career as nothing but that is only in my mind. Neither can I concentrate on anything nor can I study anything. Days are passing and I am just keeping on praying, this is really affecting my life and abstaining me from keeping a normal, healthy environment around. I am becoming selfish, jealous and panicky. Please help me!