I agree about not waiting to see the doctor until you're panicking. S.C. is right - they'll treat the panic, not the mucus, whatever it's caused by. Plus, it's always best to see a doctor when you're feeling okay and best able to communicate, if that's possible. Another thing is, you don't want to abuse the emergency room - if they get accustomed to seeing you, I don't think they take you as seriously in future. This is probably something best handled by a regular appointment with your doctor.
I understand the anxiety about the mucus. I think most of us here have gotten pretty worked up about one symptom or the other at some time. I certainly have - it goes with the territory.
My husband has a lot of issues with excess mucus. He has been diagnosed with GERD - I didn't know the two were related. (Thanks, S.C.!) He can get pretty scared about it, especially if there's any blood in the mucus. Six years of worrying about it every so often and he's still okay. I trust that you will be, too!
Best of luck with finding and treating the cause with your doctor. Sending you wishes for peace! :)
~ We may live under the same sun, but we all have different horizons. ~
Anxiety/Panic Attacks, Diagnosed 5/23/13 Celexa 20 mg
Wife of husband with Generalized Anxiety, Social Anxiety, Panic Attacks, multiple medications