For the past three days, I've been having frequent (about every 10 to 15 minutes) jumps in heartbeat coinciding with a sudden feeling of adrenalin rush and blurred vision. Each incident lasts about half a second. Within a minute, my heartbeat returns back to its normal pace.
I am 22 years old, and I'm on no prescription or over-the-counter medication of any kind, nor do I do any drugs aside from the occasional drink and cigarette. Anyone heard of such a thing?