Mine has always been fairly consistent. I've had it for as long as I can remember. The most that's gotten worse is the arthritis I'm developing because of it. I'm not sure if that's common with it, but from going untreated for probably 15 years or so and having harsh winters that last at least 6 months and being a kid that wants to play in the snow, I was brutal to my hands about it. Taking away the blood flow to my joints like that is taking effect. Mine is worse than my mom's though. She never had this problem.
However, I also have had a very hard time trying to cut caffeine out of my diet and eventually gave up. That makes a huge difference.
I would also recommend investing in some awesome mittens/gloves. I got these for Christmas: http://www.manzella.com/index.php/pr...detail/mzw-122 A bit pricey, but they're amazing. They're like a glove inside a fluffy mitten. Not a whole lot of dexterity for your fingers, but they certainly won't get cold.