Welcome to HealingWell, glad you found us. You have posted to a rather old thread as it was first started in 2007 so many of the members have not been seen or heard from in a very long time.
Pinks is a great member, however, I have not run into her in any of the forums I visit but that does not mean she won't see your post. Let's hope she does.
Palinopsia - visual perseveration; the pathologic continuance or recurrence of a visual sensation after the stimulus is gone. I do not remember reading much about this but obviously after a quick look there appears to be quite a lot of info available on the net.
From the info I found, "palinopsia does not have a treatment. It usually resolves on its own after removal of the cause". Another article stated, "Palinopsia has been treated successfully with some medications, but this is an area that is not well studied or understood".
Your MRIs and test were clear so that is good news. Do not be afraid to seek out the opinion of other DRs.
Again a warm welcome to HW. I do hope you find some answers to your problem. You have a right to feel anxious and depressed. I understand what you are feeling.