@jwatzig, I did not have Covid and I don't know if your flashing lights are associated with your recent Covid19 or to your prior injury. I did, however, have my own experience with flashing lights in my field of vision. In my situation I had a retinal vein that was leaking and caused damage to my retinal nerve, thus impacting my vision permanently. I would like to urge you to contact your ophthalmologist or PCP. Early treatment saved me from further damage to my vision.

Here is a discussion from the Eye Conditions Discussion Group - Flashing lights in my peripheral vision
https://connect.mayoclinic.org/discussion/flashing-lights-in-my-peripheral-vision/
This article, that as shared in the discussion may be of interest to you.
– Why Are You Seeing Flashes of Light in the Corner of Your Eye? https://www.healthline.com/health/flashes-of-light-in-corner-of-eye

My PCP saw me immediately, and got me in to see the ophthalmologist the next day. In m y situation it was that urgent. If you explain what you are experiencing, I think that your doctor will be able to judge the urgency of the situation. Do you have an ophthalmologist or a PCP that you can contact?