Ask GP to refer you to Dermatologist and try for accutaine. Myself and several members of my family went through years of acne, before it's miracle cure. There is a mental health risk and it is very drying, but tbh as soon as I saw it working (one or two months) my mental health improved enormously.
Accutaine or Roaccutain as it used to be called is high dose vitamin A. So whilst you are waiting it would do no harm to really try to increase your consumption of foods high in Vit A (green leafy veg etc), increase the microbiotics in your diet etc.
Hope your skin improves for you soon, whatever treatment you decide.