I thought and still feel DS has a very mild form of SPD. I've googled until my brain has hurt.
He has so many little quirks that just don't seem 'right' in comparison to what the world deems as 'normal'. My main concern was his eating and his severe reactions to different textures.

I've had him seen and apparently there is nothing wrong with him. It did take me a few years before finally getting to see someone and I think had I have gone earlier there might have been more done for him.

There are a few good sites out there along with a facebook page.

I'll see what I can dig up for you, but feel free to search the forum for my threads about it.