I went through that when I was pregnant with my daughter, and it was so painful! I cried when I got ready for work in the morning because both of my hands hurt so bad and it would be excruciating having to use my hands for the most routine things: washing my hair, brushing my teeth, buttoning my shirt, drying my hair, etc. Then, when I was at work, I would have to type or use a pen. "Ouch!" doesn't even cover it.
Turned out I had carpal tunnel in both wrists, which was causing the numbness, tingling, and horrible pain in my hands. My OBGYN wrote me a prescription for hand braces (which can be bought at sporting goods stores, among other places), which I used throughout the rest of the pregnancy. Once I started wearing them, I heard from so many other women that I ran into about their experiences with pregnancy-induced carpal tunnel syndrome. (Something to do with changes in the blood flow to the hands?) There were a few whose carpal tunnel continued after the pregnancy, but most said it cleared up after the baby was born. My own doctor told me that it may or may not go away, which I wasn't thrilled to hear (the part about possibly not going away, that is!).
I wore my braces regularly, did everything the doctor told me to do, and the carpal tunnel cleared up almost immediately after my daughter was born. Thank God for that, because I couldn't imagine trying to care for a baby (let alone 2) with my hands feeling the way they were. The braces did help, though, while the condition persisted.