Dear Suzanne, if you keep up with this level of stress you will be lucky if you are still around at the end of this journey....
please relax. I can feel your stress. You have done everything that you can at this point. You can't stress for something that is now out of your hands. If they have doubts about how genuine your relationship is they may ask you for an interview. If you did a good job at proving the real nature of your relationship you will not be asked for an interview.
If you do get asked for an interview, there are lots of areas on this site where you can go look at examples of questions that they have asked in the past. You can review those questions and prepare before the interview. You need not worry if your relationship is real. You will be able to demonstrate that. Please relax. It is not helping you right now..... All will work out the way it should. Have faith