Filing a complaint against a doctor due to misdiagnosis of a life-threatening condition

I was treated for a collapsed lung in May 2019 at a hospital in Al Ain.

I was told that I had a spontaneous pneumothorax. In January 2020, I was treated for a second collapsed lung. I went to the first hospital to get a medical report.

The report said that there was evidence of a rare cystic lung condition, Lymphangioleiomyomatosis. I got my biopsy results from the lab and saw that they had tried to inform the doctor but no contact was able to be made.

I then asked the doctor why I hadn't been told about it and she shrugged and said that they told her it was nothing.

I asked: "do you know the rare, life-threatening, cystic lung condition?", she said: "of course yes!"

I am now suffering from poor oxygen diffusion symptoms, agonizing lung pain, requiring oxygen therapy, and will be starting medication to hopefully slow the progress of the condition.

If I had known earlier, I could already be on the medication to give me a better quality of life. What will I achieve by laying a complaint?