Hmmm...maybe retest chicken again next week. I know that chicken (even organic) itself will rebound on me. Try turkey, perhaps?
Maybe next week, use IMAGINE ORGANIC CHICKEN BROTH? I don't have a problem with this. Also, I can eat my mother's organic chicken soup without a problem (just no chicken). She fishes out the chicken and eats it. Seriously, try the IMAGINE stock and see how you respond. I use this without a problem all the time. I cannot eat meat, but hey, she does dirty chicken water! (Methinks all the benefits of chicken are in chicken soup!)
Don't worry about it. It takes time with an elimination diet to sort things out. Also, it could be sugar withdrawal or something you ate earlier in the day. You seem to be fine, though, with brown rice. Also, C can make you nauseated.