Hi Ann,
i have recently suffered with this. When I saw my GP he sent me to see an eye specialist the same day. I had some tests and my sight was monitored, when it went to 20% I was give iv steroids for 3 days as a day patient. When I last saw the eye specialist my sight was back to 70%. I will see the specialist again in a few week to check the progress. I have been told it can take a few months to get better but I have also been told that the sight opinion the affected eye may never be 100%. It is about 3-4 weeks since this problem started. I hope this helps, if I were you I would ask for a referral to an eye specialist as soon as possible. My GP certainly thought it was important.
Jackie