How do i get labor going?

ok so for i dont know how long well lik a week or so i have been having horrible back pain n everytime i get up from the bed or couch or chair i feel like my bones pop n it hurts so bad! i go to the restroom n alot of like mucus stuff comes out, n i got to the restroom alot i have had diarraha(sorry tmi) n my belly cramps up at times! so wen i walk my back hurts even more n another thing i feel like the baby is like right there in my vag!!.......... omg im 39 weeks and 3day pregnant! but im in so much pain i just dont know what to do so how can i get this labor started?? also its probly that the baby doesnt have no more room but she hasent been moving as she usually does! i have a prenatal visit on the 23rd n my due date is the 22nd of this month! oh too i been feeling reall dizy n like ima pass out buts just wen i eat it scares me that i dont even want to eart alot. lol what do yall think i should do , how can i get labor going???