I use Evernote to keep my ideas together and Trello to keep a schedule. (Both free) Although I do have trouble sticking to the schedule more often than not, I keep trying, lol. I am a very disorganized person but that is also something I keep working on.
I also suffer from a few mental illnesses. I suffer from Generalized Anxiety Disorder, Bipolar Disorder, ADHD, and Depression. However, I am on good medications for all of them so they are kept under control and have been for many years now.
Thanks for sharing your organization experience with all of us. Great read!