Natural remedies before going to the doctor.

Ok Mommies. I'm 26+3 weeks and I have been dealing with extreme sinus pressure. I was sick with a upper respiratory infection a week ago but that subsided and now I have extreme pain in my sinus cavities. It's very tender to the touch and the pain is migrating down to my jaw and my throat. I plan to go to the doctor but can't get in til Thursday. Is there anything I can do to ease pain until then?