Hi Ms Rachna,
Thank you for positing your query.
I have noted your symptoms. There is no need to worry as your problem can be well treated if correctly diagnosed.
The most likely diagnosis could be 
migraine. In this condition, there is headache either on one side or both sides of head, lasting for more than four hours. There may be nausea or 
vomiting. Headache worsens in sunlight or with loud noise. 
Other possibilities include 
sinus headache and muscle 
tension headache.
Please 
consult a neurologist for diagnosis and initiation of treatment.
I hope my answer helps. Please get back if you have any follow up queries or if you require any additional information.
Wishing you good health,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad, India
Click on this link to ask me a DIRECT QUERY: http://bit.ly/Dr-Sudhir-kumar
My BLOG: http://bestneurodoctor.blogspot.in