How do you track your symptoms?

I'm 11 years in and have been through many of the treatments, supplements, and meds. I'm in a relatively good place, but could be better and think I can bring more to the table than I did previously. I want to tackle the "old" therapies again, but I want to track my symptoms. I'm a little stuck choosing between paper and pen, a spreadsheet, an app, or something else.

Any advice would be helpful. TIA.