Welcome to the forum, I too am so glad you found us.
Vaginismus is totally treatable!
It is great that you are already set up to start physical therapy. Hopefully she will help and guide you to work with dilators.
I don’t want you to have the mindset that intercourse is “off limits” in your marriage, because that is probably not true. It might not happen on your wedding night, but that is Ok, because if you are starting treatment, you will get there.
There are lots of ways to have sex, and if at first that doesn’t include intercourse, that is fine.
You are facing this issue head on, and getting the treatment process started to overcome vaginismus, and that is the first step.
Keep us posted on your journey!