Anxiety

I’m really not sure where to post this. But for the past 3 days I have had anxiety nonstop. I go to bed with it and I wake up with it. It’s so bad that I haven’t ate in 2 days because I’m so nauseous all the time and I don’t know how to stop it. I’ve already made a dr appointment today but i saw that the medicines for anxiety don’t start going in affect until about 2-3 weeks and I cannot deal with this that long. I will go insane. Sometimes it feels as if I’m not even in reality. It’s a really scary feeling and I don’t know how to stop it. Please help.