At night i sometimes wake up with extreme nausea and vomiting, rapid heart beat and fainting. it is very scary husband thinks its too much caffeine ?

Medical evaluation: It sounds very odd to wake up fainting. However, the collection of your symptoms warrants a medical investigation. Panic attacks can occur at night, and could be exacerbated with high caffeine intake. I suggest stopping your caffeine to see whether that eliminates or decreases the problem, and also seeing your physician for an evaluation. Some heart arrhythmias can wake you up at night too.