**Core Concept**
The patient's symptoms are suggestive of a primary headache disorder, specifically cluster headache, which is a type of trigeminal autonomic cephalalgia (TAC). Cluster headaches are characterized by severe, unilateral orbital, supraorbital, or temporal pain lasting 15 minutes to 3 hours, often accompanied by autonomic symptoms such as lacrimation, rhinorrhea, and nasal congestion.

**Why the Correct Answer is Right**
Cluster headaches are thought to be related to the activation of the trigeminal nerve, which is responsible for transmitting pain signals from the face to the brain. The pain is mediated by the release of vasoactive neuropeptides, such as calcitonin gene-related peptide (CGRP), from the trigeminal nerve terminals. The autonomic symptoms, such as tearing and nasal congestion, are thought to be related to the activation of the parasympathetic nervous system. The patient's symptoms, including the location, duration, and associated autonomic features, are consistent with cluster headache.

**Why Each Wrong Option is Incorrect**
**Option A:** Migraine is incorrect because, while it can present with unilateral pain, it typically lasts longer than 3 hours and is often accompanied by other symptoms such as photophobia, phonophobia, and nausea.
**Option B:** Tension headache is incorrect because it typically presents with bilateral, band-like pain and is not accompanied by autonomic symptoms.
**Option C:** Sinusitis is incorrect because it typically presents with symptoms of infection, such as fever and purulent nasal discharge, and is not characterized by the severe, unilateral pain of cluster headache.

**Clinical Pearl / High-Yield Fact**
Cluster headaches are often referred to as "suicide headaches" due to their intense pain, which can lead to suicidal ideation. Patients with cluster headaches often require immediate treatment with oxygen or other abortive therapies to alleviate their symptoms.

**Correct Answer:** C.