This patient support community is for discussions relating to Dysautonomia (Autonomic Dysfunction) including: Postural orthostatic tachycardia syndrome (POTS), neurocardiogenic syncope, mitral valve prolapse dysautonomia, pure autonomic failure, autonomic instability and others.
Ive just read about your problems with figuring out what going on, Im sorry to hear that you've had no luck finding the cause. I had very similar experiences, and have had years between faints, which as you pointed out does not make it any easier to diagnose! Its sometimes hard to catch what's really going on when only given a window as short as 24hrs. Im not sure about you but Im always fine and dandy when i go for tests!!
Im 25 and have Vasovagal Syncope, sometimes reffered to as VVS, Reflex Syncope or Neurocardiogenic Syncope and i pass out regularly, to the point where i was off work for 9 months.
If you're still experiencing problems, I really reccommend checking out CRY, Cardiac Risk in the Young and STARS.org.uk, they're the Syncope Trust And Reflex anoxic Seizures charity, thy've been amazing and may be able to point you in the right direction, eg Drs, tests etc, even with how to educate others on the subject.
You're not alone in this, keep fighting to be heard, its the only way I managed it!!
maggie