Lawn over fertilized...?

I live in Minnesota and put down Viroro Ultra Turf turf builder fertilizer with weed stop (30-0-4) at the recommended strength about two weeks ago. My wife, not realizing I had already fertilized, sprayed the entire lawn with Spectracide Weed & Feed Lawn Spray Concentrate about a week ago. My lawn in now turning kind of grey green/and brown in some places. I am thinking that it is way over fertilized and dying. Anything I can do to counter the effect! Will excessive watering help?