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It is likely that you have a problem of dysfunction tear film
with abnormal composition of the tear film. Such problem can stimulate excessive tearing
as the abnormal composition is not able to properly feedback control excessive reflex tearing which you are experiencing at this time. The cause of dysfunctional tear film include underlying eye allergic conjunctivitis
or blepharoconjunctivitis (inflammation of the conjunctiva and/or eyelid). It is possible that there is an associated eye inflammation like the presence of new small blood vessels (pannus) around your cornea due to the long-term use of contacts which now has become increasingly irritated by your eye allergy. This would explain why the use of Tobradex helps to resolve the problem after brief use but then reverts back again. To help significantly resolve this problem, I suggest that you regularly use oral Zyretc 1 pill daily, do not wear contact for about 4-6 weeks, use prescription Zylet eye drop 4 times daily for 1 week, Pataday eye drop once daily, eyelid hygiene with 50% diluted baby shampoo soaked on Q-tip or cotton ball twice daily, follow-up by warm water rinse, and then use preservative free tear drop such as Refresh or Genteal eye drop 4 tear daily as needed. You may think that you do not need tear drop since your eyes are tearing constantly. In fact, part of the reason for the constant tearing is due to lack of normal tear composition which preservative free tear drop would now provide and ultimately slow down the reflex tear production by the lacrimal gland.
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Please note that this answer is for information only. It cannot be substituted for the visit to or the recommendation of your doctor.