Water. Water. Water. It seriously helps.
You possibly need to drink more water. However there are other things that can cause your headaches like hormones or anemia. You're allowed to take 1000 mg of tylenol at a time, but you cannot exceed 4000 mg in a day. My headaches were coming every day and Tylenol wasn't working so my doctor prescribed me fioricet.
I am 9+5 days and I have severe headaches also. As soon as they start take two extra strength Tylenol and drink caffeine.That usually works for me.
Try laying dwn. Go somewhere quiet