HELP IN SO MUCH PAIN

I’m 28 weeks and I’ve been having pain in the middle of my chest. It worsens when I drink water sometimes. Sometimes the pain goes straight across to my back. I feel like a knot in my throat. It literally feels like a knot in my throat or something. The pain the the middle of my chest is so bad and shoots straight to the back. It’s like a stabbing pain in the upper back.