When I started my daughter on cereal, she had an allergic reaction to the Oatmeal but was fine with the other cereals. I would try a different kind for the time being and give the rice cereal a try again in a few weeks. I waited about 3-4 weeks and then gave her the Oatmeal again and then she was fine with it. If he is still having a reaction after a month or so, then I would suggest asking the pedi about it.
I would try a different fruit like applesauce or try some veggies. My daughter loved squash and carrots. I'm not sure if the organic bananas would make a difference or not, but I would think waiting several weeks and trying again would be the best idea. Best of luck!