Just to clear things up, DoDMERB is not the waiver authorities. For information to get the the waiver authorities it goes through DoDMERB.
I would do everything that Bumblebee states, and include how this medical condition has affected you in your words. Don't go to the medical dictionary and pull the symptoms out of there, put down how YOU were affected. Write the treatment you received. Also state what activities you are currently participating in and how the disqualification limits your activities, if at all.
As for the 10 line limit, I wouldn't worry about that. The waiver folks read medical records all day, every day, but the medical records don't always tell the whole story. Getting the applicants view point on how a certain medical condition affects/affected him or her goes a long way.
Think of it this way, the physician writes in your medical records that you have a cold and a cough but no fever. What isn't stated in the medical records is how it limited you, did the cold cause difficulty with physical activities? How severe was the cough? These are the important items that do not always get into the medical records. Let the waiver authorities know how YOU have been affected by the disqualification.