Multiple Sclerosis (MS): This condition is characterized by demyelinating lesions in the central nervous system, which can cause a wide range of neurological symptoms, including tingling sensations. The presence of bilateral sinusitis might be coincidental, but MS can sometimes present with vague or unrelated symptoms. The left side face and hand tingling could be indicative of a relapse or an initial presentation of MS.

Trigeminal Neuralgia: This condition causes sudden, severe, shock-like pain around the eyes, lips, or nose mainly because of abnormal blood vessels pressing on the trigeminal nerve in the head. While it primarily causes pain, it could potentially cause tingling sensations, especially if the nerve is irritated or compressed.
Cervical Radiculopathy: Compression or irritation of the nerves exiting the cervical spine can cause tingling sensations in the face and hands, depending on which nerve roots are affected. This could be a likely diagnosis if the tingling is accompanied by neck pain or stiffness.
Migraine: Some types of migraines, especially those with aura, can cause tingling sensations in various parts of the body, including the face and hands. Bilateral sinusitis could potentially trigger migraine episodes.

Stroke or Transient Ischemic Attack (TIA): Although less likely given the chronic nature of the symptoms and the presence of bilateral sinusitis, it's crucial not to miss a stroke or TIA, as these are medical emergencies. Tingling on one side of the face and hand could be indicative of a stroke, especially if accompanied by other symptoms like weakness, vision changes, or speech difficulties.
Lyme Disease: Caused by the bacterium Borrelia burgdorferi, Lyme disease can cause neurological symptoms, including tingling and numbness, in its later stages. Given the potential for Lyme disease to cause a wide range of symptoms, it's a diagnosis that should not be overlooked, especially in endemic areas.
Sarcoidosis: This inflammatory disease can affect multiple parts of the body, including the nervous system, and cause a variety of symptoms, including tingling sensations. It might also cause sinusitis, making it a potential diagnosis in this scenario.

Neurosarcoidosis with Cranial Nerve Involvement: A rare manifestation of sarcoidosis that affects the nervous system, potentially causing tingling, numbness, and a variety of other neurological symptoms.
Vasculitis (e.g., Giant Cell Arteritis): Inflammation of the blood vessels can cause a range of symptoms, including neurological ones, but it's less common and typically presents with other systemic symptoms like fever, weight loss, and headache.
Tumors (e.g., Acoustic Neuroma, Meningioma): Although rare, tumors affecting the cranial nerves or spinal cord could potentially cause tingling sensations on one side of the face and hand. The presence of bilateral sinusitis would be coincidental in most cases.