Last two nights I've had trouble sleeping because I've had severe back pain. Last night I woke up from really bad nausea and dizziness. I had been sweating, and my clothes were soaked. I got up and walked around, drank some water, hoping that would help. When I laid back down, I became really claustrophobic and immediately ran to the bathroom to vomit the water I drank. When I laid back down, I felt better, but still had extreme back pain.

I'm at 20 weeks tomorrow and I'm so tired.... any idea what may be causing this? I haven't thrown up since my first trimester.