Hi welcome to health care magic..... Your detail history and physical examination done to reach up to diagnosis .... Investigate with .. . -CRP -CBC -Ear examination -Blood pressure measurement etc... By outside travelling if cold there or ear infection than reffered headache can occur. . If congestion present than decongestent needed If headache unilateral and throbbing with nausea or intolerance to loud noise than migraine can be there for which rizatriptan given... Lack of sleep , irregular meal also can be cause ... If still no cause identified than it could be tension or stress headache .... Advise : Physician consultation for examination and subsequent management Take care