Breastfeeding making me sick?

Sarah
Baby girl is almost 9 months old and I'm still breastfeeding. I seem to catch every stupid virus that comes around. I can't kick them either. I've been sick on and off for 5 months. My baby doesn't attend daycare so she's not bringing illnesses home and so far she's only had one small cold. If I stopped breastfeeding, would it help boost my immune system? I'm so tired of being sick all the time. Has anyone else experienced this?