Mestenon treatment for OMG

My first Neuro doctor put me on 60 mg three times a day 8 hrs apart. Did not work . Prednisone treatment worked at 40mg but when stepped down to 20-15mg it stopped working. My second Neuro doctor suggested 90 mg three times a day every 8 hours . Doing some research on the medication found that it takes 90 minutes after starting the pill to become effective. The a dosage only last for 3 1/2-4 hours and then quickly goes away in the system. So what worked for me was taking 90mg when I wake up in the morning. Then again at 11:30am, 2:30pm and 6pm . I am at 95% symptom free of omg. I question if I should take during the night due to when I awake my eyes are very tired and my face around my eyes is in pain . I take some Tylenol and start my morning dose , plus a glass or two of water and with in an hour these symptoms have gone away . I am having issues with light glare on floors and being able to walk in large rooms . I am told that is visual migraines with no headaches but still question if it is still connected to OMG .