I was diagnosed with Optic Neuritis in my left eye, at the time o...

I was diagnosed with Optic Neuritis in my left eye, at the time of diagnosis, I felt fine. Had an MRI to check for lesions on the brain, there were none. I was put on IV solu-medrol for 3 days, then 90 mg of prednisone for one week, with a rapid taper the second week. 6 days into the prednisone, I started have shortness of breath, etc. Went to the ER and my white count was 22,000. Had bronchitis and the beginnings of pneumonia. Because of the breathing problems, I only did 2 days of taper (doctor's advice). I have lost site completely in the left eye and now I have blurred vision in my right eye. Extreme fatigue, and a mental fog I just can't explain. A "twitch" in my left left hand and muscle weakness. I just don't feel "right". How long does it take for this drug to leave your system? Has anyone had a similar experience? My eye doctor was considering another round of prednisone for the optic neuritis, but I am not so sure I can survive it.