Not all of a sudden: it has been lurking for some time, your body tolerated the exposure for some time, till at a point it won't take it any more, hence the development of the symptoms, and yes allergies can cause congestion and red ithcy eyes for weeks and months, check aaaai.org or acaai.org for an allergist/immunologist in your area, goodluck
Answered 2/4/2015
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