If you can activate Siri ask her to delete all your alarms.
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If you can activate Siri ask her to delete all your alarms.
Restart your iPhone, iPad, or iPod touch - Apple Support
the first part of this there is a description on shutting down. If this process does not work contact Apple to make an appointment with Apple to get the device fixed or put the device somewhere where it's not audible. If the phone Alarm is vibrating and you can let it do that without interrupting it then your battery will discharge faster than if you keep turning that off.
How to turn off an alarm on broken iphone