sick day

i feel like i've caught the groundhog-day bug. it seems like i've been through the same cold now, infection through full recovery, three times in the last month. nothing seems to be helping though--not sudafed, not claritin. i'm not achey or feverish, so i'm fairly certain it's not flu. what worries me, though, is that for the last ten years i've been fairly impervious to colds, and now i'm getting these same sniffles over + over again. the only thing i can track it down to is that i had stopped taking vitamin c about 6 or 8 months ago, so i've restarted a daily 3000-mg dose--though undoubtedly too late to help out in the current onslaught.