Hi. I'm online and happy to answer your question today.
Hi. It does not sound like you have had any type of stroke or TMA. First off, these things would be very rare in a person your age and secondly, they do not get better as quickly as your episode has
I agree with what you are thinking: It may just be a panic attack from all the stress you are under with the passing of your grandmother, combined with mild dry eyes.
I would suggest that you use natural tears to soothe and clear your eyes as needed when you get this blurry vision episodes and not worry too much about it. You are going to be just fine.
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I am sorry to hear about the passing of your grandmother and wish you the best during this Holiday Season.