If the issue was just what you describe, yes they will recover. If they are still hiding as a group or not eating in a week, something is wrong.
Go thru the discus best practices checklist: make sure the temps are steady 86 degrees. Feed them 3x a day with a rotation of a half dozen quality flakes, granules and freeze-dried foods. I'd do a 20% water change daily at first to get them used to the routine and your water. Make sure your incoming water has the same pH and temp as tank water.
What size is the tank? Any other fish in there?