Cervicogenic Headache: This condition is characterized by headaches that are referred from the cervical spine, often worsening with certain positions or movements, such as laying down. The burning and sensitivity in the arms could be related to cervical radiculopathy or referred pain from the cervical spine.

Thoracic Outlet Syndrome (TOS): This condition involves compression of the nerves and/or blood vessels that pass into the thoracic outlet (the space between your collarbone and first rib). Symptoms can include headaches, arm pain, and sensitivity, which could explain the patient's symptoms.
Cervical Spondylosis: This is a common age-related condition that affects the joints and discs in the neck. It can cause headaches, neck pain, and radiating pain or numbness into the arms, consistent with the patient's presentation.
Fibromyalgia: Although more generalized, fibromyalgia can cause widespread pain, including headaches and arm pain, as well as sensitivity. The feeling of bruised veins could be related to the tender points often found in fibromyalgia.

Subarachnoid Hemorrhage or Other Intracranial Bleeds: Although less likely given the description, any new or severe headache, especially if worsening with position, necessitates consideration of a hemorrhagic stroke. Immediate diagnosis is crucial for treatment.
Multiple Sclerosis (MS): MS can present with a wide range of neurological symptoms, including pain, numbness, and tingling in the arms, as well as headaches. The optic neuritis sometimes associated with MS could also cause pain with eye movement, potentially mistaken for a headache.
Giant Cell Arteritis: This condition, more common in older adults, involves inflammation of the blood vessels and can cause headaches, scalp tenderness, and visual disturbances. It's a medical emergency due to the risk of blindness if not promptly treated.

Complex Regional Pain Syndrome (CRPS): A chronic pain condition characterized by severe, burning pain at the site of an injury, which can also involve sensitivity and swelling. It's less likely but could explain the arm symptoms.
Ehlers-Danlos Syndrome: A group of disorders that affect connective tissues supporting the skin, bones, blood vessels, and many other organs and tissues. Some types can cause joint hypermobility, skin hyperextensibility, and tissue fragility, potentially leading to the described symptoms.
Neurological Manifestations of Vasculitis: Certain types of vasculitis, like granulomatosis with polyangiitis, can cause neurological symptoms including headaches and neuropathic pain due to blood vessel inflammation.