Welcome to the forums, rake. I've not been reading here for ages so haven't caught up with all the messages before now.
I just wondered why you differentiate TS from "Gilles". Gilles was M. Tourette's first name. TS is Gilles de la Tourette Syndrome (sometimes called GTS). I'm thinking perhaps you mean Tic Disorder when you were talking about the difference between TS and Gilles TS?
I'm in a different country, so can't help with the ssdi or ssi question I'm sorry.
Hudsmom, if you're still reading here...

My son took Clonidine for a very short time when he was young. He had a lot of side effects. I hope your son is doing better now.