Hey Mandy!
Just wanted to let you know that this is a very normal physical anxiety symptom. Lately, it's the one I struggle with the most. I've always had it, but for some reason, it has become the focus of my anxiety anymore. The best thing to do when you feel like this is to remind yourself this is just from the anxiety and you are stronger than you feel. Also, remember that you won't pass out from anxiety. In order to pass out, you have to have a sudden drop in blood pressure. Anxiety will raise your adrenaline and in turn will increase your blood pressure slightly so you can't possibly pass out from it. That's what I keep reminding myself of when I feel like I'm going to collapse. Hope that helps!