"Still waiting for operation after almost 6 months."

Referred by GP for surgical operation to removealmost 5 inches in diameter cyst on back in December 2013. Got appoint to see doctor in end of March and still waiting for operation date. Already had pre-operation assessment. Called clinic many times but got no satisfactory response. Just " You will receive a letter about operation date. We have a very long general waiting list and another daily emergency waiting list so cant tell you about operation date No tests have been done whether cyst is malignant or not. I don't know how one with pain can survive 6 months without knowing what he is carrying in his body. You can't sleep, sit, or travel. NHS promises for traetment within maximum of 18 weeks: five months whether you survive to see your treatment day or not. Now it has been more than 18 weeks. Worst than third world treatment in heart of first world!!