I'm falling sick every month

Hi moms. My toddler goes to daycare and this year has been really harsh for us. She's fallen sick many times and I seem to catch the sickness every time and I don't recover for a week whereas my kiddo is okay in 3 days. My entire body hurts and I am burning up but cannot keep taking leaves at work. My husband almost never got sick this whole year and takes up most of the parenting responsibilities when I'm sick. Now seems to resent me because I'm sick again. I am just fed up. Can someone suggest any nutritional supplements to avoid getting sick so often. Especially now, my toddler seems to have developed some immunity but I am still getting nowhere. I feel so heartbroken and helpless.