Heather,
Years ago, when my anxiety was really bad, my dr put me on Sedanxio - I'm in Europe, I don't think you can get it in the US.
It's a hydro-alcoholoc dry extract (60% V/V) of the above-the-ground-parts of the true Passionflower (Passiflora incarnata) - 200 mg.
1 to 2 capsules, 1 to 3 times per day.
Maybe you can find something that corresponds to this. I found it very helpful, and it allows you to function during the day, doesn't put you out. I would take it, and then I would just calm down slowly. I had bad anxiety attacks with hyperventilation, without me knowing it was that.
Hope this helps!
MarieLS