Have you spoken to your landlord or council about this at all?
As mentioned above, you need to speak to a professional about the issue. Crickets like warm and damp areas so a ceiling may very well fit that description. If this is an ongoing thing you will absolutely need to call someone in, which not only protects you but also the property from any undue damage. Definitely speak to your landlord as a first point of contact, and if they don't engage then raise it with Environmental Health or speak to CA.