Can you take something do you have a history of them I know if you do they are worse when you are pg trust me I know, I was told to take taylon (spelled wrong) but that was over 5 years ago. Call your dr and tell them how bad they are and see what that say I know there is some things that are safe to take when you are preg call them and talk to the nurse and then she will ask your dr and they should call you back. Hope that this helps I get them all the time since I was born it sucks and I am 25.
Something else you can do is use a heating pad on your head I like the king size because you can lay down on it and wrap it around you head, also take a shower but if you get dizzy with them then I would not do that, something else you can do depending home how hard it is for you to get out of the tub is lay in a warm bath to were all of your head is covered but not over your face, again if you are dizzy or think you may pass out only do this if someone is home so they can help you and check on you I know that these help me out but I also know that when you are pg you cant take real hot showers and baths too, but last at night a heating pad is great.
I hope this helps