A few ramblings... I have absolutely ZERO shunt experience. The last time Tom coughed / vomitted / seemed perfectly fine afterwards was when he had strep throat.
I don't like the sound of the shaky right arm and the right eye turning in. Somehow, since it's the same side of the body, it does seem "brain" related. And, I tend to think that if *you* have to ask the question, then it probably *is* seizure-related. But, I know of several occassions when others have posted other theories about the questionable behavior, and it's ended up not being seizure-related.
Many, many moons ago, Tom was cross-eyed. We patched for 1 1/2 years and finally found the right person to prescribe glasses. Thus ended the problem. And then, in February, we started going gluten-free. Not long after, I thought his eyes looked really good (straight) without his glasses on. And then, to my horror, his right eye started going OUT! Since then, we've gone without glasses for a bit, a new lens prescription for 2 months, then another new prescription, and we'll find out next month if we need yet a third prescription.
At his last eye appointment (beginning of August), she said he was growing and that was changing his vision.... taller, bigger head... bigger eyes. So... is he having a growth spurt? Have you made any dietary changes? (And, if you're interested, I recommend going dairy-free first, then remove the gluten later.
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Just something to think about.