Frostbitten feet?!?! Please help!!!!?

It was snowing terribly today, which resulted in many lovely deep snow drifts and slush puddles. Unfortunately, my boots were useless as they were not waterproof. Within minutes of leaving my apartment, my feet were soaked to the bone, and since I didn't have any change in footwear, I had to spend the entire day at work with my feet submerged in freezing ice water. Then I had to trudge through the snow and slush all over again in order to get home. When I got home, my feet felt horrible. I took off my drenched boots and socks and my feet are all purple and swollen. Is this frostbite? If it is, what should I do? Any help or advice would be greatly appreciated!