School suspention for child with disability?

I will try to make this short and to the point as best as I can. I have a 10 yr old son, who hasn't been able to run, jump, climb stairs, ride a bike, and has a gait disturbance, which I have taken him to numerous doctors for, they have ran every test in the book, and everything comes back normal, since the age of 2. he also has nervous tics,and adhd, and is not medicated. His doctor would also like him to be tested for bi-polar, since it is hereditary and his dad has it. The doctors dont want him medicated at this point, because of the unidentified neurological disorder and waiting for the bi-polar screening. Anyway, I got a phone call the other day from the school, saying that they are suspendeding him from school, for making noises in the cl. He has a clicking noise that he makes , especially when he is nervous or excited. he will even click in the middle of a sentence, in between words. I think this is horrible that they would punish him, for something that can not be controlled. Everyone is telling me to contact a lawyer about this. Any suggestions?