Jodiebones Said:
"Someone has my I’d and passcode, how do I get them off my Apple ID?"
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Three Things to Do:
A. Deauthorize All Option:
Try Deauthorize All. You can only Deauthorize All items once every 365 days. So, you may have to wait up to a year before you can perform this.  Go Here: Authorize or Deauthorize your Computer for iTunes Store purchases - Apple Support
Also...
B. Modify your Credentials:
Having so much suspicion, consider modifying your credentials, ASAP, starting with a new password.
Also...
C. Verify the Devices:
Verify that the devices assigned to your iCloud are your devices: Check your Apple ID Device List to See where you're Signed in - Apple Support