Positive TB Blood Test

Hi, I tested positive for TB recently and I have been refered to a doctor for chest X-RAY in the next 3weeks. I think 3weeks is too long and I do not know how long I have been infected also. Can i ask the doctor about how long I have lived with this? I do not feel really sick at the moment but I have had on and off coughs, swollen neck glands and chilly chest pains. The last time I had this symptom was just december 2008 and the cough stayed for about 2weeks. I normally get these symptoms after exposure to dust or smoke and in the form of cold with dripping nose and slight head pains. Is TB completely curable and will I test negative after treatment in case my xray is abnormal? What do you think my xray will look like? I am very worried about this cos I thought with TB, patients must be severely sick with strong cough etc. Pls help me.