The correct answer is "trichotillomania." This is the correct answer, as this term describes the obsessive-compulsive condition in which patients have an uncontrollable urge to remove their hair, which causes baldness, and social/emotional distress and impairment. Patients typically pull hair from the scalp, eyebrows, lashes, and extremities. Treatment includes a variable combination of psychotherapy and/or medications.

On the other hand, the other choices are incorrect. Walking-corpse syndrome is a psychiatric condition in which a patient thinks that they are dead, while in reality, they are indeed alive. Arachnophobia is a fear of spiders. Agoraphobia is a fear of being in public places. Last, social phobia is a fear of social situations.

The "worst headache of my life" or "thunderclap headache" is characteristic of subarachnoid hemorrhage. This is bleeding in the brain and must be treated urgently. It is usually caused by the rupture of a berry aneurysm within the blood supply to the brain. Hypertension is a major risk factor.

Multiple sclerosis is an autoimmune process with no exact known cause. The myelin sheath is attacked and plaque formation occurs in various regions of the CNS. Without myelin, nerve conduction slows down and may eventually be completely blocked leading to widespread loss of function. 

Loss of the dopamine-producing neurons describes Parkinson's disease. Excess dopamine describes dementia. Deficiency of acetylcholine describes Huntington's disease, and the autoimmune disease of the neuromuscular junction is known as Myasthenia Gravis.

Bell's palsy is due to dysfunction of cranial nerve VII, the facial nerve. The facial nerve provides motor control to the musculature of the face and sensory innervation of taste, facial sensation, and parasympathetic innervation of the submandibular and sublingual glands. 

Migraine headaches are commonly treated at first by over the counter (OTC) medications such as NSAIDS and acetaminophen. Other treatment options include triptans, antidepressants such as amitriptyline, and anti-hypertensives (beta blockers and calcium channel blockers).

Petasites hybridus (butterbur) is a flowering plant of the family asteraceae. It has been shown in studies to reduce the frequency of migraine headaches by as much as 68%. None of the other herbs listed have any significant medicinal benefit in migraine headaches. 

One non-pharmaceutical intervention that has shown to provide relief for a significant number of individuals with cluster headaches is 100% oxygen, delivered via mask at a minimum of 12 liters per minute. Relief can be felt in as little as 15 minutes. None of the other interventions mentioned would be likely to improve symptoms of a cluster headache.

While Bell's palsy is most frequently associated with prior infection with herpes simplex 1, is may also be associated with cytomegalovirus, Epstein Barr virus, and herpes zoster.

In the vast majority of cases Bell's palsy resolves within 1-6 months without medical intervention. Moistening of the affected eye (rather than nerve resection) is required during this period to prevent corneal damage. There is very little risk of permanent paralysis or loss of taste. 

The most common causes of seizures include brain injury or tumor, genetic predisposition, medications, and infections such as meningitis. While marijuana may be a trigger for sensitive individuals with seizure disorders, it has not been known to cause seizures in a non-epileptic individual and has shown to reduce seizure incidence in some individuals with this condition when used in a medical setting.