headaches headaches headaches

De
I'm 20 weeks pregnant and have been suffering with a terrible headache for 6 days now. I go to bed and it's still there in the morning, it varies in intestity throughout the day. It feels like pressure builds in my head when I stand up or bend over and I have a lot of eye strain pain. 
Has anyone else experienced this? 
I've tried paracetamol, caffeine, cold and hot compresses, and also those menthol sticks. I'm really fed up. Does anyone have any recommendations for things to try?