Hi, I Was Working While Snowing For Like 45 Minutes

Hi, i was working while snowing for like 45 minutes and the hat were full of snow. when i came home, i felt headack. since 8 days, i have low fever around 37.6 (from my mouth) with headack. please can you tell me if this can be cause by the snow or not and what should i do. i saw a doctor and he asked me to make a radio for lungs and blood test, results were negative and nothing abnormal. please advise me what to do..
THANKS,
Rabih