Arimidex and oncologist

Fatigue, flashing in the left eye, worsening migraines:
I have been on Arimidex since July, 2007 (after lumpectomy in January 2007, chemo, a mastectomy in same breast in August, 2007 followed by radiation) and seemed to be tolerating it quite well, except for the fact that I wanted to go to bed at no later than 9PM every night.
Recently, however, I had noticed retinal problems in my left eye (could also be a result of my nearsightedness and my age --61) and worsening migraine attacks which I could not relieve completely with my usual medications. I did research on Google and found that Arimidex could indeed lead to worsening of headaches and perhaps lead to retinopathy as well.
This morning I decided not to take the pill and called my oncologist's office to find out what he thinks about stopping it for a while.
I have also made an appointment with a neurologist since I haven't had a brain MRI since 1987 (to rule out other causes than migraine for my headaches).

My 89 year old independent mother-in-law started low dose Arimidex after mastectomy 6 months ago. She experienced sever bone/hip pain (requiring a middle of the night ER visit). She was advised by the oncologist's office to discontinue Arimidex. Several weeks after stopping the Arimidex she began to have night sweats, becoming increasingly severe.. She is uncomfortable, to say the least. Is this truly a side effect of stopping arimidex? Have others experienced this side effect post arimidex? Should we look into some other cause?

Does Arimidex cause hair loss?