Im in a lot of pain

My solar plexus thing is killing me. Ive been crying for hours, i am extremely nauseous from it. Im 36 weeks pregnant. When i stand up it goes away but, when i lay down it gets so much sharp and worse. I dont know what to do. I've never experienced this before. Not even with my first pregnancy. I kept feeling like i need to use the bathroom but i dont. Anyone who can help i would really truly appreciate it.