My tooth has been hurting and nothing will help...?

I'm 22 weeks pregnant and the dentist said they wouldn't do anything until October. I've tried orajel, that makes it hurt worse. I got red cross toothache stuff that doesn't help either. It hurts really bad when I have something sweet. It doesn't hurt when I chew but after I eat it sometimes starts to hurt. I do have a crack in my tooth where it hurts but that's only on the bottom, it hurts on the top and bottom. It makes my jaw hurt and my head. I have fillings in the teeth that hurt. I have really bad teeth. What could it be? What could I try to take the pain away?