Repetitive Strain Injury (RSI) or Work-related Musculoskeletal Disorder: This condition is likely due to the symptoms being work-related and improving afterwards. RSI can cause numbness, tingling, and pain in the affected limb due to repetitive movements or poor posture.

Carpal Tunnel Syndrome: This condition can cause numbness, tingling, and pins and needles in the arm, especially if the work involves repetitive wrist movements or flexion.
Thoracic Outlet Syndrome: Compression of the nerves or blood vessels between the neck and shoulder can cause numbness, tingling, and pain in the arm, which may be exacerbated by work activities.
Ulnar Nerve Entrapment: Compression of the ulnar nerve at the elbow or wrist can cause numbness, tingling, and weakness in the arm, which may be related to work posture or activities.

Multiple Sclerosis: Although less likely, multiple sclerosis can cause numbness, tingling, and weakness in the limbs. Early diagnosis and treatment are crucial to prevent long-term disability.
Spinal Cord Compression: Compression of the spinal cord can cause numbness, tingling, and weakness in the limbs. Prompt diagnosis and treatment are essential to prevent permanent damage.
Stroke or Transient Ischemic Attack (TIA): Although rare in a 30-year-old, a stroke or TIA can cause sudden numbness, tingling, or weakness in the limbs. Immediate medical attention is necessary to prevent further damage.

Peripheral Neuropathy: Certain conditions, such as diabetes or vitamin deficiencies, can cause peripheral neuropathy, leading to numbness, tingling, and weakness in the limbs.
Brachial Plexus Injury: Trauma or compression of the brachial plexus can cause numbness, tingling, and weakness in the arm.
Tumors or Cysts: Rarely, tumors or cysts can compress nerves or blood vessels, causing numbness, tingling, and weakness in the limbs.