Suggest Treatment For Headache And Dizziness

I have been taking contiflo 400mg capsules for the last 3 weeks as prescribed by my doctor without any apparent side effects. However all of a sudden over yesterday and today I have become very dizzy even when lying down in bed.I have not experienced dizziness before. It is quite sever even to the point where I have felt want to fall over. I also have an incipient headache but have taken nothing for that. David