How do I get over severe wedding day anxiety?

I am marrying the man I truly love and couldn't be happier. We have been living together for some time and are having a baby together as well and we couldn't be more happier. BUT I suffer from social anxiety when I am in front of big crowds. We eloped and got married in the courthouse alone but for the church ceremony we are planning an after party. I am absolutely terrified of this day,even though its in 3 months, its all I think about! I get shortness of breath and my hands begin to shake like crazy and I have unrealistic fears of making a fool of myself. I don't like getting attention but this day all eyes will be on me and this makes me feel so anxious. The thing is, I was the one pushing for this to happen. Also the fact that I don't have a mother or father to show up for the biggest day of my life, also feels very sad and lonely. I also am pregnant and am scared this stress will harm my baby if I don't find a way to cope. Please give me the best advice on how to calm down my irrational fears of people. I don't want to ignore this problem and run away every time I get scared. I don't want to miss out on life or have regrets in the future.