Why has my nose turned purplish and big? Wc fields like.

Rhinophyma? The "wc fields nose" is the lay term for rhinophyma, which is thought to be due to untreated rosacea. It was thought at one time that this appearance was associated with excess alcohol consumption, but this is not true. The skin of the nose becomes very thick and inflamed. This can be rather effectively treated surgically.
Purple nose. Sounds like rosacea. See a dermatologist soon and start on some meds to get it under control.