First off, don't panic. I am going to say some words that depending on how much t.v./movie specials you've watched may freak you out. BUT DON'T PANIC. Remember, despite what the tv execs say, shows are not reality.
It sounds very similar to my son's symptoms 8 years ago; it sounds like Tourette's. (Again, don't panic!) The repeating words-- ecolalia, repetative motions- tics, and noises -- vocal tics, are all tell tale signs. (Don't panic) In addition OCD is often a secondary issue with Tourette's. (Don't panic :))
My 13 year old son has Tourette's which presents itself with rather mild tic symptoms and is accompanied by OCD. He is a straight 'A' student, has many good friends, plays on baseball and basketball teams, does Tae Kwon Do, participates in Boy Scouts, plays both the piano and drums.... I can go on and on. Tourette's is just something extra he has had to learn to work around, just as anybody with asthma, diabetes, allergies, etc. To be honest with you the OCD has caused bigger issues than the tics.
I highly recommend you make an appointment with a pediatric nuerologist. You will notice I used the words 'sounds like': I can't diagnos your son :), duh. I don't know where you are located but OHSU has a terrific set up. They even have a Tourette's medical group that is made up of pediatric specialists from multiple fields. We saw Dr. Koch, pronounced Coke, for the official diagnosis. Now we just return every 6 months, or so, to check in. They have also been able to help us with controlling the OCD, which got bad for us as we entered puberty. (Yea rah, puberty.)
I know this next bit of advice will sound counter intuitive but at this point DO NOT visit the Tourette's Assoc website question and answer section. It will freak you out. So often the people who write in with questions/issues are at the end of their rope and their feelings of desperation are quite strong.
Get a good pediatric nuerologist and read, read, read.
Please also feel free to contact me via this website.
Remember: don't panic :).