I think my Apple ID was hacked

No, if you haven't jailbroken your iPhone, it's not possible.

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If you think your Apple ID has been compromised

If you think your Apple ID has been compromised - Apple Support

See who has access to your device or accounts

See who has access to your device or accounts – Apple Support (UK)

Security and your Apple ID

Security and your Apple ID - Apple Support

Manage and use your Apple ID

Manage and use your Apple ID – Apple Support (UK)

Recognize and avoid phishing messages, phony support calls, and other scams

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

For more support and assistance see -> Contact Apple for help with Apple ID account security

Contact Apple for help with Apple ID account security - Apple Support

I do not believe your phone tweaking is the cause of a hacker but you should definitely contact apple support or go and visit your nearest Apple Store if possible, they will be able to help you there.