Focus more attention and money on the things that mean the most to you. After your dress, if that is the cake, the food or the honeymoon; then you can cut a few things out that you value less. Eliminate the things you can truly do without. Do you have creative friends that can help you with making some things like your invitations, wedding favors, table numbers, escort cards? This can reduce your costs or allow you to put the funds on something else.
Always take a step back when you feel that anxiety and do something that normally calms you down and makes you feel good. I have a craft I do, it works like therapy for me. If something in particular is stressing you out, can someone else handle that part of the planning for you?
If you can't serve a lot of food for your reception, stay away from an evening event. You can serve a few very good foods or treats. The treat bars are a wonderful option and can serve as wedding favor gift for guests too.
I am the Owner for Bridal Letter and I had a small gathering for my wedding in the early 90s. The cake was important to me, but I kept it smaller and very beautiful. I spent money on the bouquet because I love flowers and on the photographer. I rented my dress, had a very reasonable priced headpiece and had help with the food. Honeymoon was local, that allowed more money for the wedding.
Just keep in mind what you value the most and then list the rest under that and it will guide you through your planning a little easier.