You certainly have a lot on your plate right now. I get anxious when I have alot going on because I always feel like I am going to forget to do something. I find lists really help me. Also, if you can find some time in the day to clear your head that might help. Exercise helps to relax me and it is my time away from everything. Yoga is great for the mind and body too
Planning a wedding is difficult in itself. I am planning my wedding now too. I feel like there is so many things to do/remember. I put together a masterfile with my budget and when everything is due. I also put together a file fax with a tab for everything...venue, church, band, photographer, etc. It seriously helps! Because if I ever have a question about anything I look to my folder!