Tuberculosis treatment. Outside walls.

My sister had few symptoms like water formed in legs and not feeling hungry.. doctor has recommended to go for chest X-ray and informed that some water is there in chest outside walls ..they have taken water by injection and analysed the fluid and told that the water formation may be due to tuberculosis and gave the medicines.. But after started the medicines not at all feeling like to eat and whatever eats it is getting vomitted and unable to sleep in the night time and becoming lean. whether these symptoms common during the treatment and how much time these symptoms may continue. after how many days she will become normal.Kindly address my concern.. Please advice how can she move further.Thanks in advance