Etymology: New Latin, from English hysteric, adjective, from Latin hystericus, from Greek hysterikos, from hystera womb; from the Greek notion that hysteria was peculiar to women and caused by disturbances of the uterus Date: 1801
Its an expression, like "...some crazy old man" or "...some punk kid" or "bitchy".
Advice:
1) Don't sweat the small stuff.
2) It's all small stuff.