the most important piece of information that i need to know is "how old is the child and how much does he weigh? " i will also need to know what other medications you may have given him. i would recommend tylenol or an acetaminophen product to start for the headache. i would also ask a few more questions about the "sinus pressure" to define it more. benadryl is ok but i would probably recommend a claritin or zyrtec-type product because they work longer and have less side effects.
is it okay to give my son benadryl and advil for his runny nose sinus pressure and headache?