opinions before I go to doctor

Sy
I am 38 weeks and 5 days. I have never had any issues with high blood pressure or any other pregnancy related health problems. Today however, my heart is pounding constantly, I'm nauseous, and I just have this feeling of dread like I used to get before panic attacks (which I haven't had in almost a year). I've been drinking water, trying to rest and nap, took some tums, took a shower, tried distracting myself, but nothing is working. My doctor is completely booked today and I don't want to come off as the psycho pregnant lady who forces herself into the office over nothing. What would you do?