Symptoms of heart palpitations may include a passing sensation of a pounding, rapid, fluttering, or skipped heartbeat. These sensations are usually felt in the chest but may also be felt in the neck and/or the throat. Generally, there are 2 broad types of palpitations.
Flashes of light that appear as jagged lines or heat waves in both eyes, often lasting 10-20 minutes, are different. They are usually caused by migraine, a spasm of blood vessels in the brain.
One possible cause for sudden bright white light in your vision could be the retina in your eye could be coming unattached. you MUST see an opthalmologist and get it looked at if it continues persistantly. This is not a good thing but it can be fixed if you act quickly.