To me it sounds like maybe you had a palp and then your anxiety kicked in causing the other symptoms. When I do that I realize it's anxiety then that's it.. don't act on it. Journal how you feel and see how it repeats itself. It will also help reasure you that it's happened before.
Best of luck, Bin! I don't know about the evaluation stage (I live in Canada so we don't have this) but in my intake appointment, the doctor just asked me what I wanted to get out of therapy and asked what concerns I had about my mental health/wellness. That was when she decided CBT might be the right intervention for me -- which I totally agree with. We didn't start any actual talk therapy at that point, but it was a good start! I hope yours goes great (I know it's a couple weeks away but still exciting and a big step).