You really have got to share with the care coordinator OT. The care coordinator needs to know what the support worker has been saying to you. The support worker's behavior is totally unacceptable and unprofessional and the Care Coordinator needs to know that. I know you are worried about a statement from this worker, share your concern about that with the Care Coordinator also. In fact you could even share this post you've written here because that explains everything. The support worker is being abusive and threatening towards you and that is something that definitely needs to be put right, not just for you but also for any other clients this worker is abusing.