What is happening to my face and teeth? How can it be fixed? (Photos)

Hello, I've included pictures so hopefully this will explain what i mean. This time last year i had a back molar on the far left of my mouth taken out. I wasn't advised to get an implant to replace the tooth loss and since then the whole side of my left face has sunken in. The right side of my face also seems to be pushing outwards as shown by my picture. Does anyone know what is happening with my face and most important how to fix it (3rd pic is of my face last year before tooth loss)