Mass hysteria in this day and age makes me balk-- there are just so many things bombarding our lives, brains, nervous systems, not to be certain it's one of them is negligent, imo.
If it's only the cheerleaders, personally, I'd look straight to the manufacturing of their uniforms and pompoms-- I'd check the chemical composition of the finished product, how they are laundered, if they were laundered before being worn, how they were stored at the manufacturer (ruling out any contamination from rodent urine/feces, for instance). As the girls are athletes, it seems possible the unis could leach into their systems if contaminated (contact absorption). I'd check the paint/dye of any hand held item-- pompoms for example. We all know how toxic some of the cheap jewelry and toys from China can be (lead, cadmium), I don't think these girls' choice of jewelry or hair ornaments (from Claire's, for instance) would be any different. (I can immediately add bejeweling their cell phones to the list of things to check.) jmo
Whatever it is, I hope the symptoms clear up for all of them...