Can focalin xr cause facial and large muscle tics?

My son was on Focalin XR last year for 6 months when he was 7 yrs old and also developed the facial tics. I also know another mother that the same thing happened to her son. I took my son off of the medication and despite pressure from the school, (since last year he was able to focus better while on Focalin and the tics didn't start until school was over) I am opting to find an alternative more natural treatment that can hopefully fix the underlying issue.

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I do beleive that the Focalin is what caused the Tics due to the medication doing something to his digestive system that prevented him from processing sugar and carbohydrates correctly causing a yeast build up. When the body has a yeast build up it does not absorb magnesium correctly which leads to a magnesium deficiency that can cause tics. I found this out through some Tourettes websites. After removing him from the Focalin XR I started him on "Yeast Defense" and removed as many carbs and sugar as possible. I then began giving him a Magnesium supplement and low and behold the Tics finally went away because when I initially took him off of the Focalin the Tics had actually gotten worse.
At this time I am still researching to find a definitive resolution to his inability to focus in school and reading problems. He is not dyslexic and his IQ is normal we already did a full Educational Battery with him. He does have some Some Sensory Processing Disorder symptoms and he was receiving therapy by an OT.
I had him tested by a Visual Optometrist and found he is under 1 % of the population for Binocular Vision and Eye Tracking so this is the problem but the Therapy is not covered by my insurance so back to the drawing board.
I have been researching since and found a Brain Balance Therapy that is not covered by insurance but the founder wrote a very informative book that has detailed information on his theory, checklist to identify, vitamin information, therapy for home, etc. I downloaded the book from amazon the name of it is "Disconnected Kids by Robert Melillo" It is very informative. I have not started the therapies in the book because I just finished reading it.
I am currently giving my son 2 kid multi vitamins twice a day, 2 kid omega gummies twice a day, magnesium and Natures Chi. He is still very low on magnesium even though he does not have the tics.
I took him to get a TAO massage (1 hr) and she was very concerned his muscles would not relax for the entire hour though he swears he loved it. It did relax him somehow I suppose. I am now looking at the muscle tension aspect (nervous system) I found a supplement today called Nerve Shield. He took the first one tonight before bed. He is also a toe walker... you know all the pressure points in the feet for the eyes and the brain are in the Toe Area... I really do think our kids bodies are trying to give us hints to what's going on.
I also took him to an natural herb place for the vitamins and they read his energy points and that is where I found out he still is extreemely low on magnesium and they also verified that he had problems in his digestive tract and the middle top of his brain is weak. Which after researching is the part that relays information from the muscles, nerves etc to the left and right side of the brain and from the left and right side of the brain to everywhere else in the body. The Brain Balance theory is making even more sense now.
So basically my plan now is the vitamins plus the Nerve Shield, Therapy in the book I mentioned and Qigong (stretching exercises for cleansing)that soothes the nevous system and restore mental clarity by harmonizing the right and the left brain.
Though I am spending a ton of time researching and the steps I am taking involve more input that if her were on medication it is worth it. It broke my heart when I saw his tics especially when I knew he did not have them before I put him on the medication. Good Luck with everything and I hope by too long of an answer helped you in some way.