According to Young, the following steps should be taken when dealing with a patient possibly in a coma:

Perform a general examination and medical history check
Make sure the patient is in an actual comatose state and is not in a locked-in state or experiencing psychogenic unresponsiveness. Patients with locked-in syndrome present with voluntary movement of their eyes, whereas patients with psychogenic comas demonstrate active resistance to passive opening of the eyelids, with the eyelids closing abruptly and completely when the lifted upper eyelid is released (rather than slowly, asymmetrically and incompletely as seen in comas due to organic causes). Find the site of the brain that may be causing coma (e.g., brainstem, back of brain...) and assess the severity of the coma with the Glasgow Coma Scale
Take blood work to see if drugs were involved or if it was a result of hypoventilation/hyperventilation
Check for levels of serum glucose, calcium, sodium, potassium, magnesium, phosphate, urea, and creatinine
Perform brain scans to observe any abnormal brain functioning using either CT or MRI scans
Continue to monitor brain waves and identify seizures of patient using EEGs

Initial evaluation
In the initial assessment of coma, it is common to gauge the level of consciousness on the AVPU (alert, vocal stimuli, painful stimuli, unresponsive) scale by spontaneously exhibiting actions and, assessing the patients response to vocal and painful stimuli. More elaborate scales, such as the Glasgow Coma Scale, quantify an individuals reactions such as eye opening, movement and verbal response in order to indicate their extent of brain injury.
Treatment
The treatment for vestibular neuritis depends on the cause. However, symptoms of vertigo can be treated in the same way as other vestibular dysfunctions with vestibular rehabilitation. Physical therapy
Typical treatments include combinations of head and eye movements, postural changes, and walking exercises. Specifically, exercises that may be prescribed include keeping eyes fixated on a specific target while moving the head, moving the head right to left at two targets at a significant distance apart, walking while keeping eyes fixated on a specific target, and walking while keeping eyes fixated on a specific target while also turning the head in different directions. The main function behind repeating a combination of head and eye movements, postural changes and walking is that through this repetition, compensatory changes for the dysfunctions arising from peripheral vestibular structures may be promoted in the central vestibular system (brainstem and cerebellum).Vestibular rehabilitation therapy is a highly effective way to substantially reduce or eliminate residual dizziness from labyrinthitis. VRT works by causing the brain to use already existing neural mechanisms for adaptation, neuroplasticity, and compensation. Vestibular neuritis rehabilitation is an effective and safe management to improve symptoms. The vestibular neuritis rehabilitation can improve symptoms or resolve the symptoms which is dependent on each individual. Rehabilitation strategies most commonly used are:
Gaze stability exercises – moving the head from side to side while fixated on a stationary object (aimed at assisting the eye to fixate during head rotation without the input from the lost canal vestibulo–ocular reflex).