Believe it or not, your symptoms sound consistent with a migraine phenomenon, but the type called an acephalgic migraine, or migraine without the headache. It is not uncommon at all for a person with a history of migraine headaches to develop a different character to their migraines, even developing the visual phenomena (even if it is different) without the headache. I've seen patients as old as 75 who haven't had a migraine in decades all of the sudden start to have these acephalgic migraines; it can be certainly be a confusing diagnosis.
As long as there is no weakness/numbness, difficulty walking/talking, double vision, or complete (even if transient) loss of vision in either eye, then this acephalgic migraine can just be observed (waited out). If they become bothersome, then they can certainly be treated with migraine preventive or abortive treatments that your doctor should be able to prescribe you.
Does that make sense and does that help address your concerns?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.