Kate, No apology necessary! We've all been where you are--usually many times. I was so low when I joined this forum that I was ready to quit it after one day because of one unsympathetic comment a member made. The forum moderator sent me a private message that made me feel better, and it's been mostly good since then. One thing I have to remind myself often is that the written word without the benefit of tone and facial expressions can often come across differently than what was intended, so I try to give people the benefit of believing they weren't trying to be a jerk
I'm glad the limited Feingold information is helping you. Feel free to PM me if you have additional questions or specific foods that your son eats regularly and you want guidance about what brands are approved to see if you can get them in your area.
I agree with Heather about the "P" tube (chewable tube) There is also chewable jewelry (for boys and girls) and gum. The one approved on Feingold is Glee Gum, which you can purchase on Amazon or iHerb.