Getting sick???

So my son will be 2 in February (he's the first and only child so far) and was never in daycare until he was around 10 months old- since he's been in daycare I feel like I'm LITERALLY always SICK..... It's so frustrating! Honestly, the minute I start to feel better a day later I feel like crap all over again. Has this happened to anyone else? I've heard the saying before but in regards to nurses- that the first year of them being a nurse they were constantly sick, I was just wondering if this had any correlation for kids entering school or daycare since they're around a lot of others, etc. Just wondering if I'm the only one or if it's something else!