To get lost in a corn field represents being lost in the enormity or plentifulness of a situation. You may have lost your purpose, bearings, or original intentions. You might be overwhelmed by possibilities, opportunities, or options. You may feel that there is too much of a good thing.
Example: A woman dreamed of being in a corn field that was on fire. In waking life her marriage was ending. The corn field reflected the abundance of love and support she got from the relationship that she felt would never end.