It appears you have chronic allergic conjunctivitis. The best treatment is to avoid the specific allergen, however, that may not be possible in all cases. The steroids help to decrease the inflammation and allergic reaction, but symptoms can restart if the medication is stopped. It is not recommended to use corticosteroid eye drops for a prolonged period of time.
It is helpful that you've had allergy testing already. Also, think about what changes in your environment (work and home) that started around February that could be other potential sources of allergies (indoor plants, pets, detergents...).
Treatment is based on the severity of the symptoms. Chilled artificial tears can be very helpful. Steroids as you already know are helpful, but not recommended to be used long term. The Patanol you are using is an antihistamine and mast cell stabilizer which will help to prevent exacerbations. This medication works if when used consistently. You can also try an NSAID drop (similar to Ibuprofen). You can also ask you allergist to see if desensitization treatment is an option.
Here is a good website that gives you an overview of chronic allergic conjuncitivitis.
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