Thanks for using health care magic for posting your query.
I have gone through it in detail and I can understand what you are going through.
The kind of headache that you are describing seems to be that of sinusitis
. It occurs when there is inflammation of sinuses
and the pain classically increases on coughing and bending down.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.