I see you are in England. I am honestly not sure how it works over there. Here you can walk into any emergency room and they will admit you. Call an ambulance right now and go to the hospital.
We cannot help you here other then to listen. If you went to the hospital they can help you and get the voices to stop. I know that it's difficult. It's fantastic that you realize you need help. My ex suffers from psychosis and hears voices - I know it's hard. If you suddenly stop your medications that can be very, VERY dangerous. Please, take everyone's advice and go to the hospital. They can give you enough medication to get you through this.
Also for your medications not sure if this link can help you.
http://www.pparx.org
A lot of companies are offering certain medications for free if you qualify.