Oh hon I'm so sorry this is happening to you I'd be scared out of my mind. Is there anyone living with you/in your building who can keep an eye on things? Like if a neighbor sees someone suspicious they could also help by calling the police.
Try to think who it could be, if you know them. Sophia's link was really helpful, I think. One interesting point - if you change your number keep the other one connected with an answering machine??? I don't know maybe the police would know more or something

Please stay safe - try to get someone to check in with ((((cantstopcrying)))))