I agree with Cam and K8EB.
Firstly, if you think someone is following you, take pictures/video and watch it back. If there's someone there then they are not an hallucination, though you need to be careful that they are not just walking the same way as you but you're paranoid you're being followed.
Then the next step is to show the photo to someone quickly and call the police.
Or if you are in a busy place and you see someone with an axe or any kind of weapon then you can shout/get someone else's attention. If it's not a hallucination then other people will also react.
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