As the doctor says, this seems to be kind of normal--in an abnormal way!
Take a look at this link discussing a connection between episcleritis and the monthly cycle:
Dear Dr. Hagan,
Thank you for your response. I have been seeing a ophthamologist that specializes in eye diseases. I have had numerous tests done, and have seen a rheumatologist and an endocrinologist. Now since this happens once a month and right after my period ends, I am assuming that this is a hormonal thing. Very Frustrating!! :( Thanks again for your response.
1. See an ophthalmologist that specializes in cornea/external diseases near you.
2. Ask that Eye MD or your family MD to refer you to a rheumatologist to exclude an underling disease that is causing this. You may also need oral anti-inflammatories.
3. Yes this is a rather common history for episcleritis/scleritis.