Twinkle!
Anxiety can really do a number on us at this point, can't it? Horrid thing....
I think the long bike ride, or a long walk, or any kind of exercise, especially outdoors, can definitely help to relax you and give you other things to think about. And, an exercised body tends to deal with stress-factors much better and just makes us happier in general.
Very happy for your upcoming nuptials, and even though your mind has you twisting in knots, try to count to ten and refocus yourself (easier said than done...) on something pleasant and encouraging. Do what makes you happy every moment and spoil yourself as much as you can. You deserve it!
In closing, I'd like to share a dancing banana with you. Why?? To celebrate your upcoming "big day" and to maybe brighten this one a bit!