Manda.
I have anxiety for 15 years.
I have gone through same marriage you're talking. Everything will be alright.
To be honest, when i was waiting my wife at the aisle i felt like panic attack, at that moment i had these thoughts : "omg, i will have a panic attack, I can pass out or get embarrassed, I'll ruin everything" but then I was like let this be.... I embraced that anxiety that was coming, started breathing deeply and slowly, didn't resist the anxiety and just switched my thoughts on my wife "Look how beatiful she is and how people are smileing everywhere, such a beatiful day"
It was hard at the beggining of the wedding cause i was anxious evrything to be alright, but after some minutes/hours I already drink a little of wine, I told myself that "damn, this happens only one in my life, why should I ruin it with worrying about all this anxiety and other crap, and just let it be"
I felt great, the wedding was excellent and the guests were very happy.
And trust me, you'll be so tired that you'll not be able to be anxious.
Everything will be fine, a bit of anxiety is always good, but when panic comes in, don't try to resist it, let it come, hug it and even if you pass out (but its very unlikely, not common for panic), everyone will understand cause emotion +tiredness
Let worries come to you, don't react, and they'll go away as fast as they came.