Hi Kiti Sharma
Welcome to Health Care Magic
There are several hospitals in each city which offer the check - master check up, executive check p and so on.
Any tertiary care multi-speciality hospital can do this.
Any Internist (General Medicine specialist can help...
However for your headache you should see a Neurologist
/ For stomach pain, your brother should see a Gastro-enterologist...
Wishing speedy recovery