Headache in second trimester

Hi!!  I just turned 18 weeks today... I saw my midwife last Tuesday due to headache & dizziness. My headache has been going on almost everyday for the past two weeks. Its not too bad though. My nurse thought i might have preeclasmnia. I told my midwife about it and she said she checked everything and all looks good. She said it could be the protein or sinus infection.   I know one thing that having headache everyday is not normal.  Help me out please. Maybe I'm not eating enough. What do I need to eat to improve so my headache can go away.  I dont want to take one tablet of tylenol everyday.   Any advice & help would be great appreciated.  Thank you!!