My 16 Year Old Daughter Has Just Started Treatment For

My 16 year old daughter has just started treatment for latent TB and after 2nd dose last night today she had really bad stomach pain was clammy heart racing and felt sick. Tonight she was sick she only had breakfast but since being sick she feels a bit better but still not right. I can't get hold of any TB nurse but she has since eaten and hopefully holding it down. How long will she feel like this.?