My To-Do List Disappeared. Can you help?

AlisaS

I had an extensive To-Do List. Probably more than 100 people I needed to go back to and research their family members, etc. Yesterday when I was adding an item to the To-Do list, the entire To-Do List disappeared and only the item I added was shown. I added another item, and now only those two people are showing. Please can you help return my To-Do list? This happened yesterday March 18.

Thank you