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.
Most probably it may not be related. The indentation over head may have been present since long and you might have noticed it only when the problem arised. If the headaches
has started with the flue then most probably the headaches might be due to the general inflammatory response and not due to migraine
. You should take plenty of rest and good amount of water. Flue will settle down by self and if it persists then you should get it checked.
Hope I am able to answer your concerns.
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.