Hi there ~
are common and it is situation specific. Please identify what it is that is causing you to have headaches and try to cure it and you will be better off instantaneously. For example if you feel like your headache is worse in libraries that have old books, you may be allergic to molds and so you may start to have headache and shortness of breath
along with sneezing
etc. Also you may need to get tested for allergic rhinitis
and / or asthma
either substance induced or seasonal so as to be able to get the right treatment. An allergist or a general physician who can give you the appropriate referral may be helpful. In either cases do not be worried as there is a solution to your problem. Do not linger on it, please act on it.
I hope this helps. Take care and have a good day !