Should I be worried about this?

I've been getting this short flash of light in my eyes that appears every 3 days or so, and it's so intense that I sometimes fall to the ground.

You should go see an eye care specialist to ensure that there are no issues with your eyes that would be causing this.

Yes, light flashes in an eye could indicate a developing problem,
especially if it is increasing.
Please see an eye MD ASAP.

Your symptom is very unusual. Get checked.