I agree with all the other moms about Motrin and Tylenol - but something else that I ended up doing for Samantha during dinner time was to put either frozen banana, mango, or other fruit inside one of those mesh bags that you can get at Babies R Us. I forget what they're called, but babies can suck on them. So, I'd freeze the fruit, put in the bag, rinse it under water for a second and let her go to town.
I think the combination of chewing and the cold really numbed her gums before the bedtime hour. But there were definitely nights she still needed Motrin or Tylenol because it just sounded so painful. I cried along with her - just felt so bad.
OH - and I also would rock her and let her chew on a cold teether if she was crying.
Good luck and hang in there. It's only temporary!