Hi. Thanks for your query. Read and understood your history about your son. He is suffering from tuberculosis of the parotid gland and is under the proper treatment of R-Cinex, Combutol 1000 PZA 750 and Beplex. Take Dolo 650 for fever and headache. Has a severe headache with vomiting. This is not a side effect of the anti-tubercular treatment. The most probable cause of headache can be tuberculosis in the brain or its coverings. I would advise him the following: MRI of the brain. Spinal fluid analysis Review test of blood and urine, liver function tests. Once the reports will be available and have an opinion of the Neurologist to get a proper diagnosis and treatment.