Got one, too. I was petrified when I first found it. But now, I just don't even think about it much. I didn't have one with my first pg, but, well, here I am. I don't notice mine too much, except if I'm sitting or standing for too long, or if I lay on my right side, it kinda throbs. I've heard they can also itch, although mine doesn't. Mine is huge, too.
As far as what you can do, there are a few things to help alleviate the pain, but I don't believe they will actually go away until the baby is born.
Avoid crossing your legs.
Avoid laying on your right side (even though you should avoid this as much as possible when pg anyway)
The nurse practitioner told me to get a pad slightly wet with water, freeze it for a bit, and then place in your underwear. The cold should feel good on the varicosity.
My OB told me to roll up a gym sock and place in my underwear. The pressure against the vein should help alleviate the pain.
That's about all I can think of. HTH a little.