Very sorry to hear that you have been so sick. I wonder if it is possible that you get sick about as often as other moms who are NOT nursing? I believe that it is likely that just about any new mom could possibly get sick more often that other healthy adults because of the general stressors of being a parent: less sleep, interrupted sleep, difficulty finding time and opportunity to prepare and/or eat healthy meals, being exposed to many more germs that older children bring home from school, the great difficulty of findiing any time to exercise or do any kind of caring for oneself, etc. Is it possible that if you took extra steps to try to remedy some of these things? You may also want to consider that the possibility does exist that in weaning your older child, you may expose yourself to more germs and viruses if the weaning makes your child more susceptible herself because she end up being sick more often. Sounds like a difficult and exhausting situation and I wish you the best.