Hoping for a smooth recovery for you! Might not have anything to do with your situation but my brother was having problems with passing out randomly, they narrowed it down to caffeine as the cause. (took about 2 years for them to figure it out) once he stopped drinking caffeine completely he has not had another one. Once again not saying by any means this is your problem but if you drink a lot of caffeine you may want to have them look at that.