Tics/Tourette's: Things That Have Helped Us

My 10 year old son recently developed serious tics. He has always had tics that were quite mild not noticeable to the average person. These newly developed tics affect his entire body. He also has vocal tics. He finds this quite distressing, embarrassing and exhausting. These tics were so bad that they were interfering with everyday activities including falling asleep and cause muscle fatigue. When his tics are acting up he seems to have a much difficulty with impulse control, has a terrible attitude and exhibits many "ADD" type behaviors.
Our pediatric neurologist suggested eliminating dyes and preservatives from his diet. We saw an immediate reduction in the tics but they came back after a while and were much worse when he was stressed or excited.
We have totally eliminated all artificial colors, flavors and preservatives and greatly reduced, but not eliminated the tics. Chamomile tea often reduces and calms the tics. We have learned that calming and soothing things seem to help.
While experimenting how to reduce the effects of the tics it occurred to me that there may be a homeopathic remedy that will help. We purchased a product for restless leg symptoms because the tics have the urge to move and jerk around. It did not help much.
We also purchased the homeopathic remedy chamomilla in the 6x dosage. This comes in the form of a sugar pill or tablet that you put under the tongue and let it melt until gone. It worked! Within minutes of the first dose his tics were significantly reduced. We continued giving three tablets every 4-6 hours (not while sleeping) for several days and the tics gone! He no longer takes them on a regular basis but asks for them when the tics start acting up, for example he asked for them about half an hour before guests were expected to show up for his brothers birthday party because the excitement got them going.
Maintaining a strict diet of absolutely no artificial colors, flavors and preservatives is essential. Consuming these things cause the tics to come back, although they may not show up until the following day.
Stress also causes the tics to come back, so we maintain regular bed and wake times, we are careful to be very choosy about the social events we attend to prevent this.
My mother used many homeopathic remedies when we were children. The procedure for taking the little tablets is simple. Do not eat or drink 15 minutes before or after taking the remedy. Place the pill(s) under your tongue and hold it there until it is fully dissolved.
I do not know if this will continue to work. I have read that tics come and go so it is difficult to know if a certain treatment works or not. I will follow up on this. This treatment can cause no harm and will only improve our health by avoiding things that are potentially harmful to us anyhow.
I have discovered that artificial colors have a negative effect on me. After eliminating them from our diet I can often taste them (sort of a bitter aftertaste) and find that I have a very difficult time focusing and processing information and feel very out-of-sorts after consuming them.