It could be PANDAS. My son also developed vocal tics and was an emotional wreck. Antibiotics will kill the strep but after a while it's not going to help. Staying on a 2x a week prophylactic dose will keep strep at bay if exposed.
You have to keep in mind that the problem at this point is not the strep itself but what the body is doing. The autoimmune issue with PANDAS is that the body for some reason now thinks the basal ganglia portion of the brain is a strep infection and is fighting it. Since the basil ganglia is always there it takes time for the immune reaction to calm down. It took us 3 1/2 years, months of oral antibiotics, intramuscular antibiotics, 16 months of IVIG and homeopathy (which was most effective) to get my son's titers to normal range.
IMO, don't worry about your Disney trip, and I say this from experience. When my son was diagnosed 3 1/2 years ago it was a very little known disorder. It's come a long way in recognition since then. We flew from NY to CA to see the one doctor in the country who was the man to see back then. We decided while we were out there we would attempt
Disneyland and Knott's Berry Farm. We figured worse comes to worse, we'll never see any of those people again. The plane ride out was a horror, I thought they'd ground the plane and throw us off. At Disneyland he was amazing and probably because he was so overwhelmed in a positive way that we really enjoyed it. Other than his vocal tics and this dropping to his knees thing he started doing (quickly resolved by sticking him in a rental stroller) he was great.
One thing that SERIOUSLY helped with the OCD for my son was inositol. You can even google "inositol OCD" and see that studies prove it works. It is just a form of a B vitamin but for some reason it helps. If you want to try it I highly recommend making sure you buy it in pure form, either a powder (tasteless in drinks) or in caps with no other ingredients or additives so if he doesn't do well you know its from the inositol and not from one of the added ingredients. We buy the Kirkman brand from ourkidsasd.com. My son was about your son's age when we started using it. We use 6 grams a day now. The kirkman powder comes with a scoop and he gets 2 scoops 3x a day. I stick it in his juice in the morning and at dinner at home. For lunch at school I either put it in his thermos and when he takes a water bottle I unscrew the cap, put it in and shake it, and recap. It doesn't taste like anything so he won't know its there. I would start with 1 scoop 1x a day, then 1 scoop 2x, then 1 scoop 3x, then work up to 2 scoops 3x. It truly made a big difference for my son.
You can see a psychiatrist if you want but you have to remember this is a medical issue and if the psychiatrist prescribes meds to treat the behaviors caused by PANDAS you are putting a band aid on the problem.
http://www.latitudes.org/forums/index.php?showforum=17
lots of knowledgeable and supportive people there.
Also, make sure you are loading him up on probiotics while on antibiotics or you end up with a whole other set of issues. Make sure there is no S. Thermophilis in the probiotics. It is a strep strain, and while a beneficial one, many kids with PANDAS react negatively to it since the body is already confused about how to handle strep. Also, NO YOGURT!!! Yogurt, all brands, contain S.thermophilis as an "active culture." I did not know this and my son who had been casein free for a year had a yogurt when we were testing his allergies and all hell broke lose. It was not from the dairy but from the yogurt cultures.
Kerrie