Allergic Conjunctivitis: This condition is the most likely diagnosis due to the presence of bilateral eye itching, clear drainage, and rhinorrhea, which are all common symptoms of an allergic reaction. The symptoms are often seasonal and can be triggered by allergens such as pollen, dust, or pet dander.

Viral Conjunctivitis: This condition can cause similar symptoms, including eye itching, clear discharge, and rhinorrhea, although it is typically more contagious and may be accompanied by a red, watery eye.
Dry Eye Syndrome: Although dry eye syndrome typically presents with a gritty sensation rather than itching, some patients may experience itching, and clear drainage can be present. Rhinorrhea is not a primary symptom but can occur in conjunction with other conditions.
Blepharitis: This is an inflammation of the eyelids that can cause itching, burning, and clear discharge. While rhinorrhea is not a primary symptom, it can coexist with other conditions that cause nasal symptoms.

Giant Papillary Conjunctivitis (GPC): Although less common, GPC can cause significant discomfort and is often associated with contact lens use. It's crucial to diagnose and treat GPC to prevent long-term complications.
Keratoconjunctivitis Sicca (KCS): A severe form of dry eye that can lead to significant morbidity if not properly managed. While the primary symptom is dryness, some patients may experience itching, and clear drainage can be present.

Atopic Keratoconjunctivitis: A rare condition associated with atopic dermatitis (eczema) that can cause severe itching, clear discharge, and potentially lead to corneal complications.
Vernal Keratoconjunctivitis: A rare, seasonal condition that typically affects young males and can cause severe itching, stringy discharge, and potentially lead to corneal ulcers or other complications.