No. I'm afraid that there is no known treatment for the damage that has been done to your retina other then stopping the medicine and crossing your fingers. What you have is in no way related to age related macular degeneration, other then it is affecting the same area of the retina, the macula.
I wish that dilating the blood vessels would be helpful but the retina already has the highest blood flow of any tissue in the body. There is no need to increase it. And you've hit the issue right on the head: Medicine has no effective treatment for this type of retinal toxicity other then document the problem, make sure it's not something else, then just sit back and hope and pray.
Have a happy holiday season -- as best as you can given what is going on -- and we will stay in touch. Talk to you later.