G'day.... thankyou for replying.Hope your having a good day.... ohk to your first question. i collapsed at school twice, with fast heart, and weird breathing, after walking to my class, in summer, so i got taken to doctors, they said that it was just nothing. then it kept hapening, neer colapsing everyday, (because of the heat, it was summer, it made it worse) then i went bak to docs, and they refered me to a cardiologist beacuse my dad demaded. they just werent doing anything for me, then it hapnd the next day, neer collapse, and i got taken to hospital. they couldnt find anything after 5 hrs being there. the netx week i went to cardiologist, they said i probly have svt, or inapropriate sinus tachy. then after the stress test, i lasted on it for 3 minutes walking quiet slow, with a heart rate of 206. so they stopped me before i collapsed, and sat me down. got put straight onto best blockers, which helped. then i kept having fast heart everyday, and feeling breathless the usual, but this time also having a weird flip-flop feeling in my heart so i got sent to ST Vincents hospitail in sydney top visit a elecrophysiologist, who did tests and saw wen i stood up and felt faint, it was my blood pressure., he said that my heart rate increased, and blood pressure went real low, so my heart didnt have much to pump. i was put on a larger dosage, of metoprolol. i have to have blood tests alot, and, everymonth i must visit my gp, my doc sed this. just to make sure im ok with blood pressure and heart rate. i get my blood test results tomorro!! i have high cholesterol(6.4) they think it might be hereditary. hopefully, tomorros test will show a drop in the level though. wow this is so cool.... its cool that all you know what i feel like eveyday..... for a bit i thought it was in my head, and was begining to doubt myself. I just have to have to say this... i hate it wen i make my bed coz i get puffd out.... do u guys aswell? i guess you do. also do any of you get affected by eating chocolate.. it makes my heart race.worse. oh by the way answering your other q. i was diagnosed with IST, then it was found i had POTS asweel, and that the POTS made my IST worse. wow thats confusing.and my symptoms are al the ones listed on this site that names symptoms.um, ther is a family history of heart probs, a couple of 2nd cousins mysteriously droping dead whilst playing football, they were my age. and also my grandmother has cardiomyopathy,(diagnosed a year ago, same day as i was with IST) and she used to complain of geting dizzy wneh she stoood up, especialy in the sun, docs didnt think anything of it.Thanx for listenning, i have to go and have my santa photo now hahaha, yep 17 and still getting them, with my sister (16) and brother (12) we get them done to keep our parents happy! hahaha, hav a great day......luv kybutterfly.