Is it just wedding jitters or an anxiety disorder?

I've always have problems with anxiety, but I've been able to control it by leaving the situation, running away you could say. I'm engaged and for the first time I can't run. I've dated every kind of guy and only been able to committ to one other relationship which ended up with my ex-boyfriend sleeping with the girl in the apartment below me. So I finally meet this wonderful guy and we are engaged but the closer the wedding date gets the sicker I get. I've lost 14 pounds in the last month and I'm wasting away to almost 100 pounds. Everyone wants to help me, but the only person that can help is myself. I have absoulutely no appetite and have to force myself to eat. I wake up with nausea every morning and can't get it under control until the late afternoon. I can't swallow and I am incredibly irritable. I wake up between 6:30 and 7:30 every morning and can't go back to sleep. I saw my fiancee with another girl the other day and blew up. Some days are better than others, and I finally have it under control to the point that I can work. This is supposed to be the happiest time of my life but it's turned into the darkest. Am I supposed to postpone my wedding that's all planned? The doctor has put me on Ativan and Celexa, but the only difference I've noticed is I'm really tired and "out of it". Can anyone relate or give me some advice?

It sounds like more then regular wedding jitters. It does not mean it's not right for you to get married, or he's not the one, etc., it just means that you need to talk with someone. Remember the runaway bride in Atlanta? Don't let something that drastic happen. Talk to someone now...your mom, a friend, or even see a counselor. There could be other things that are making you feel this way, and the wedding is worsening that for you. Don't go through this alone or without seeking some sort of help!