Two questions for the Online experts in the field:
1) Does HSP come in various degrees of intensity (mild HSP, strong HSP, ...), or is it a black and white thing where you either are one or you aren't?
2) What's a reliable test?
I'm pretty sure I'm one, but I don't strongly relate to all the symptoms (that I know of). I do have plenty of physical indications (very sensitive skin and body parts), environmental indications (overly sensitive to bright lights, loud and sudden sounds, overwhelmed in masses, ...) and behavioural indications (empath(ish), fairly easily emotionally moved (especially for a Thinker in terms of MBTI), ...).