Firstly, you cannot let this problem affect you in this way. Don't hide away. No one has hurt you or threatened you directly. So please eat and drink properly. Next, you must collect evidence of the harassment. Film or record the incidences and keep a written log of everything so that you can take it to the police again. Also look for resources in your country. There are links given in the article above.
If you continue the way you are then they have beaten you. Don't let them take your life away.