Thanks for writing in.
Leukaemia of the central nervous system is extremely rare (in patients who do not have leukemia and presenting with headache only). I won't consider it as a possibility in your case.
Since all your exams and test results are normal, it is very unlikely that you have a serious disorder.
Given your symptoms, it is more likely that you could be suffering from a simple tension headache or sinusitis. These can be easily differentiated on examination.
Tension headache is usually relieved by tablet aspirin 325 mg as and when required ( upto 4 tablets daily) with food. Additionally, distressing with deep breathing and yoga also helps.
Sinusitis would be relieved on steam inhalation and some anti-histaminics like cetrizine. Please see a physician to find out the reason for headache so that appropriate therapy can be started.
Hope that this information helps and hope that you will get better soon.
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Dr. Indranil Ghosh
I should also add that I have had a persistant sore throat for around one month. I have also read that this can be a symptom of a "frequent infection" associated with leukemia.