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I can only guess, but you probably used the iD-Editor?

As far as I understand you, you started changes in it but did not upload them.
Since the iD Browser only runs in the browser, the changes are not cached there when you exit the browser.

This is similar to a text document that you start in Word, for example, and then exit Word without saving. Then all your text is gone too.

Your changes are lost forever, I’m sorry to say. It is always advisable to upload changes to OpenStreetMap in smaller packages on a regular basis. Smaller packages means about 25-50 changes and also keep the area of changes as small as possible. So for example don’t add a cafe in Canada and in the same set of changes add a bank in India.

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