Thanks for your question.
Yes nice is a pain killer(NSAID) and has lot side effects so what is need is to diagnosed the cause of your headache for that i need some detailed history like site,duration, periodicity,nature of headache.Is is associated with photophobia
nausea,what kind of vomiting you have?is it early morning and projectile in nature.you please describe those things to me then i will definitely help you.please remember nice is only symptomatic treatment but you need definite treatment.
Nice and knee pain during menstruation
probably have not side effect of the drug.