Hi A.,
My son was formally diagnosed at 18 months, but we had been told by others that he had SPD from about one year old. My daughter, who is 19 months older, was diagnosed at 4 1/2 years old. I second Sensational Kids by Lucy Jane Miller. It is MUCH easier to read and understand. I would also recommend Raising a Sensory Smart Child by Lindsey Biel and Nancy Peske. This one is extremely helpful when it comes to suggestions for difficult issues. It gives several suggestions on how to deal with sensory issues your child might be having. (Difficulty with toe walking, food preferences, clothing, etc.)
Feel free to e-mail me off list also. My son went through EI, then the school district's preschool program, and at the end of kindergarten, they declared him cured. (NOT!) I'm near Arlington Heights and EI was through CFC #6. The parent liaisons there were extremely helpful, and even started book groups and support groups focused on SPD. We were allowed to attend even after our son aged out. I learned SO much talking to other parents who were at different stages of dealing with this disorder in their child or children. There is hope; my son seems extremely normal, and has progressed immensely since he was a toddler. The sensory diet is now second nature to us, although it seemed overwhelming at first. He is still getting private OT, but we feel he still benefits from it, and our insurance covered most visits last year.
There are also online groups through Yahoo. I think one is "sensoryintegration" which is national or international, and the other is "SPDIllinois" which is more local. There are some members from the national/international one who are trying to plan in person meetings in the northwest Chicago suburbs, but it hasn't taken off yet (we just started talking about it the last 2 weeks...)
M.