I have a board called To Do's. I have all of my business to dos, calls, diaries, etc listed. All of them are gone.
Are you not able to find that specific board or the board is there, but the cards are missing?
If you click the Trello icon on the top-left of the screen, you will be able to see all your workspaces and the boards within those workspaces.
And if you mistakenly closed that specific board then you can re-open it by following the directions here https://support.atlassian.com/trello/docs/reopening-a-closed-board/
The board is there, all the cards are missing. There is nothing under closed.
Please make sure you don't have any filters turned on https://support.atlassian.com/trello/docs/filtering-for-cards-on-a-board/
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