Does temporary acquired LQTS exist?
It sounds like you may well have had acquired LQTS if this was in association with severe electrolyte disturbances, and resolved on telemetry when they corrected it. If this is the case, as much as you hate doctors, please stop dicking around. If you lost consciousness because you went into polymorphic ventricular tachycardia as a result of LQTS, you need to get this all figured out and fixed as soon as possible — ie before it happens again and you die. It really is fairly unusual for an otherwise healthy 30-year-old to develop that degree of hypokalemia and hypomagnesemia, as someone else already noted. If noone has addressed that issue, figured out if it was an isolated incident or a recurring problem, what the cause was, etc. then you really should seek out a good internist. While seeing a good cardiologist or electrophysiologist probably wouldn’t hurt, it sounds more like the electrolytes are the heart of the problem here (no pun intended).
