I'm another who can relate to the whole sensory hypersensitivity issue. Usually, and typically, it is sounds that are most overwhelming and distressing for me, and this can take the form of too much volume, or simply too many competing overlapping sounds and noises all of which feel as though they are ceaselessly clamouring for my attention, an attention I can't accurately divide well enough to cope with all of them.
Strangely, I also experience a different sort of sensory overstimulation, a sort of spatial invasion of my personal space where suddenly the world can feel too close, too full of "things", too intrusive of the basic space and oxygen I need around me in order to feel safe and functional. It's hard to describe, but can drive me to virtual panic, as it can feel impossible to even accurately identify, and therefore quite impossible to escape from.
I know to recognize extremely high and escalating levels of stress and anxiety when this "spatial overload" becomes a problem, they are usually the times I need to take active measures to remove myself from the world for a time if at all possible, because nothing good will happen if I persist.
Maddog