If it were me, i would absolutely find my way to a therapist. I know that an exercise program that you like, i.e the gym, pool, sauna, etc. might help you to keep it together and give you an outlet for your energy. The energy you put into worry can be harnessed into an activity that will reap you rewards. If you feel at peace in a Church, make sure you go to give you a sense of equality with others. I can't wait to hear that you have turned the corner on your anxiety. If you do all the things that are suggested for dealing with anxiety, and that doesn't work, then your therapist can talk to you about perhaps taking medication that might help you. I wish you peace on this journey and please let us know how you're doing.
Everyone has anxiety from time to time. The important thing is keeping it in perspective and coping with it. Do you have anxiety in other areas of your life?
It does sound kind of irrational, if the two of you go on and later decide it doesn't work, so what? But obviously this possibility is bugging you a lot. See a counselor or therapist and talk over your fears.