Somehow my alternate email address was changed and when I try to edit it says that email is being used by another account?

Will not let me change my alternate email address...says it's being used by another account.  Don,t know what I have done.

It probably really is being used by another account. That account holder may be you, or it may have been an Apple ID used at one time in the past, which again may have been you. Doesn't matter which. Once it's used, it can no longer be used by anyone, ever again.
By "already in use" it means that email address might be an Apple ID, or an "alternate email address" associated with any Apple ID that has not been deleted from that Apple ID, or a "rescue email address" for an Apple ID that also has not yet been deleted. Therefore if you have another Apple ID go to https://appleid.apple.com/ and using the "Manage your Apple ID" button, check your account for alternate email addresses. If that email address is present, deleting it will make it available to use for an Apple ID.
Rack your brain for any other Apple IDs you may have used in the past.

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