Pain Management Tracker has a built in journal too. With every entry you can choose to write as much or as little as you want about how your pain, side effects, symptoms or anything else is going. In order to access the journal entry, simply right click on the Entries list and pick Edit.
Once you choose Edit it will open up the journal dialog.
You only have one journal entry per pain entry. So if you right click and choose Edit again it will bring you back to the same edit dialog.