Is Cold Feet After A Bump On The Head Normal?

I am a 30 year old man. I am 5 foot 4 and I weigh 170 lbs. I bumped my head really hard against the inside edge of my car yesterday, and the blow caused an istant cramp on my neck muscle which lasted a few seconds. I had a really bad headache throughout the rest of the day, but today I feel like my feet are extremely cold; As though there isin't enough blood flowing down through my legs. Is this normal? What should I do?