help headache

I've had a headache for 4 days!!! When I sleep I wake up with it worse!! 
It's not like I wake up an it comes back it literally never leaves. I drink water, so much so that drinking water makes me want to throw up now. I haven't been hungry at all the last 3 days (but I've ate lol) I went for a walk, I've taken medicine (which I hate doing pregnant), cold compress, everything! Any new advice! I feel like my head is going to explode. I'm 13 weeks