Teen heart conditions, please help?

I have had heart problems for years. The summer after my freshman year on a swimming trip my heart began to beat at a rate of 240bpm but my pulse was only 60. I went into the camper and laid down for two hours untill it ped. Shortly after, I went to my doctor who sent me for tests because of my age they had to be read at childrens hospital where a brutaly meen doctor told me my problems were all my fault (and get this) because I didn't drink enough water (apparently 8-10 cup isn't enough). Ontop of this every doctor i went to would look at me and ask "are you on drugs" I would honestly answer no but they would always ask if i was sure. By the end of sophmore year i was feeling like a hypocondriac and had no diagnosis aside from a slight mitral valve bowing. My problems progessed and my heart even stopped once at and acting competition while i was onstage. Junior year my singing began to affect my heart and choir became so painfull that i couldn't stand. my choir director was sending me to the nurses office daily. I started to up my daily exercise in hope of helping the problem. I went from and hour and a half a day to two. I was always in pain but i did anything to stay in my fine arts cles. I was also on a special diet aproved and monitered by two dietitions. things kept getting worse. now this ped year i encountered a new problem any belting would upset my heart for a moments and then i would black out and my knees would collaps. This would not have been a problem save for the fact I was the co-director of my draama clubs production of chicago. Then my swelling in my feet got so extreme that my toes turned black in the shower. then i lost my ability to exercise any more than ten jumping jacks and i would fall asleep for sixteen hours. finaly a few months ago i became old enough to go to a real cardiologist. as soon as she saaw my age she began to think i was making it up. with begging and pleading i final got on a thirt-day heart moniter. sadly while wearing it my heart rate never went above 178 so she told me i was fine. again i begged and got to go to yet anouther echo that showed my bowing had progrested to prolaps. beyond that all they saw were some svt's and miss firings. after this i was sent to an electrophysiologist who yet again told me i was just a teen and this was normal. when he told me that a heart rate of 170 was normal in an active teen i snapped and shouted "i was watching tv when that happened". his eyes got huge and all he could say was "well if you're not retaining fluid then ou're fine. I kicked my shoe off and showed him my swollen foot which by the way i now have to buy extra wide because they're so big. Fianlly i thought someone was listening he set me up for a tilt table tast and an electrophysicology study. then i found out his concern was fake he never bothered to call to schedual them. finaly yesterday i called down and force his nurse to schedual me. i go under in a few days but i have a feeling i'll be told the same thing. If anyone has suggestions of how to get people to listen or whats wrong with me then please post. also i'm sorry for the length of this question.