Hepar Sulph, is a very interesting homeopathic remedy to study for its suitability to those hypersensitive individuals that get affected by everything in their environment around them in a disturbing way. Here is a look at the Hepar individual constitutionally-

The oversensitive Hepar is so excitable in his sufferings, that even the littlest of causes can bring on symptoms on every level. Being sensitive to cold physically he will be so sensitive that he can endure much heat in the room, many degrees warmer than a healthy person ordinarily desires. Emotionally he is overtly sensitive to impressions  and to his surroundings, so he might suffer from setbacks with more vehemence than an ordinary person would, the impulses will overwhelm him and make him wish to kill his best friend in an instant. 

There is impulsiveness that shall show up uncontrolled almost like an animal instinct without any consideration for the circumstances that he is in, when troubled he may have an impulse to set things on fire, the mother wants to throw her baby in the fire, a desire for destruction. 

Putting the hand or the foot out of bed (uncovering), another symptom that can be looked at as the hypersensitive state of the nervous system detecting the slightest changes in the environment, kind of like Mercurius, hence known as a remedy that has a sphere of action in patients that have mercurial affectations.These patients have been called human barometers. Physical affectations appear with the slightest cause, the eruptions, boils, and ulcers will hurt like sharp sticks jagging through them. Pain threshold is low, so he may faint with pain, even with slight pain. Exposure to cold will make inflammatory and rheumatic pains appear.

The contrast in the way a Hepar feels chilled on the physical level, to the way he has this impulse to set things on fire, may be reflective of his insatiable need for warmth that he lacks, and he compensates for it emotionally with these strange desires, like he wants to set things on fire, deluding the world is on fire, an impulse to set herself on fire, are all perhaps indicating the need for heat! Just like Kent mentions, that he just can’t seem to get enough of heat, so he layers up, sits in an extra warm room, more than what a normal human being can endure.

Every little thing that disturbs the patient makes him intensely angry, abusive, and impulsive. Nothing pleases; everybody disturbs. His inability to find comfort in one single state makes him restless, displeased and discontented and so he desires a constant change of persons, things, and surroundings and each new surrounding or person or thing again displease him and makes him irritated. 

-Source: Lectures on MM, by JT Kent http://www.homeoint.org/books3/kentmm/hepar.htm