Another option you could try for this or any other additions:
In Create Pain Entry. Under Description, where it asks what does your pain feel like? Select the appropriate words and/or add new ones: It says search or add... Click on this and you could possible put multiple entries like: Fatigue, Fatigue mild, Fatigue moderate, Fatigue severe. It will then be added to your regular description words for that time and future.
The reason I list fatigue then the type is that they can be lumped together for easy use in future. It can be for any descriptive word that you may want to have multiple descriptions of that word.