Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
You have a headache after your surgery. Probably the operation was performed with spinal anesthesia
. Now in spinal anesthesia there is a loss of CSF and that leads to this kind of headache which reduces on sitting or lying down. It is self limiting and will reduce in 2 weeks. Keep yourself hydrated and take some rest.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
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Wish you good health,
Dr. Srikanth Reddy M.D.