Second trimester headaches

Heather • Pregnant with baby #2!
I was looking for any input or home remedies for bad pregnancy headaches.  I read that they are common in the first trimester, but I'm 15 weeks now and they've just started.  So severely that they are lasting all day.  Tylenol helps but barely, I've tried sleep, water, eating a snack or meal, a cold shower, nothing seems to relive it. And I've noticed it gets worse early in the morning and late at night.  Any of you out there suffering from anything similar? If so any suggestions on relieving them?