I breastfed my daughter for 3 1/2 years. My daughter showed symptoms before she was born, meconium ileus. I felt similar to you; afraid to wean because I know how good breastfeeding is for the baby. I think any amount of breastfeeding is good, sounds like you are doing your best at keeping the bf going. I doubt there is any scientific data that states symptoms show once bf stops. So much more comes to into play which I'm sure you know. You are doing your best. A suggestion that may sound really odd; there are breast milk banks for sick babys and moms who can't breastfeed. I remember trying to donate pumped breastmilk to them because I had pumped out sooo much when my daughter was born(she couldn't nurse for 2 weeks because of her meconium ileus) Just thought I'ld toss that info out there.