dr not listening to me :/

For the past few weeks I have been having daily headaches. They prevent me from sleeping. I am taking tylonal twice a day almost daily because of how bad they are. I tell me dr about them all the time and he just shrugs it off. I have pcos that I take metforman for and I also have hashimotos. A thyroid disease. And yet he has never checked my blood sense mentioning the headaches. I get headaches along with seeing little black dots. I'm so frustrated. This is my third pregnancy I'm 17 weeks. I have never experienced this before. :( have any of you experienced this? What should I do?