Re: Brain tumour
If your headache is improving and symptoms are abating, then you're likely to see self-resolution of the condition.
If, however, you are experiencing increasing headache, problems with your vision and increased sensitivity of your scalp, then I'd be concerned that a condition known as Temporal Arteritis may need to be ruled out, most particularly if you are over the age of 50. It is quite rare prior to that age.
Indeed, these symptoms are not associated with a brain tumor. Remember that pain is typically the last symptom of such tumors and only arises because of limited space in the brain cavity that is under compression by the tumor process. A wide range of symptoms occur far prior to detection of pain. You'll be fine in that regard.
Again, if symptoms are worsening or you detect changes in your vision then I'd have your primary care doctor or neurology specialist have another look.
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Best regards and Good Health