What Causes Headache With Blur Vision?

I am struggling with bad headaches almost everyday. I went to a doctor who told me it was due to a throat infection, however the tablets he perscribed did not work. I am suffering even more so with my eyes. The minute I wake up, I am experiencing double vision like I am drunk or I get a film over my eyes. It is very hard to focus, and it is constant through out the day. I am a diving instructor who is abroad and I am getting worried to the point I might have to go home. Please help me.