I've blacked out while drinking a cup of very hot coffee twice this year. The episodes were several months apart, and happened while I was driving. Each time starting the exact same way as getting "freeze brain" from a slurpie. I felt a heavy pain in chest, then head ache. I believe I was out for just a few seconds. The first time it happened, I woke up very confused as to where I was. The second time, not confused but clearly realized it had happened again. I totally ignored the 1st incident but now I'm concerned. Has Dr. Appt. In few days. What can this be and what should I ask my dr to do?