Slendersickness

Slendersickness is a mental and physical condition bought on by exposure to the Slender Man, with symptoms becoming more serious as exposure increases.

Symptoms
The theorized order of illness is as follows:

Stalked: First Encounter: More than five (5) sightings:
 * Nose bleeds with fever like the common cold, mild amnesia
 * Nose bleeds, exhaustion, nausea, strong cough, vomiting, amnesia, slight signs of radiation poisoning, aches and pains, slight trauma of the eyes (i.e. blood shot, vesial popping etc...), deja vu is commonly seen at this point.
 * Coughing up blood, blood in vomit, many signs of radiation exposure, painful breathing, difficulty in swallowing, violent convulsions and major amnesia.