I was just diagnosed with IST after a long, laborious year of tests and a lot of useless medicine. I am 24 years old and have had signs of IST for as far back as I can remember. I get dizzy, have a racing heartbeat, have near blackouts and have a severe intolerance to exercise (have had episodes of black-outs and near passing out on the tennis court and a feeling as if my heart will explode). Am always short of breath and also have difficulty with standing, getting out of bed, etc. etc. My heart rate frequents 160bpm and higher.
Initially, the dr's thought I had anxiety probs, so I was put on Xanax and then Paxil. After further testing, they realized from the results of my holter test that I wasn't crying wolf, so they put me on Atenolol, which didn't work. I went from Atenolol to Cardizem CD, from the Cardizem to Verapamil, and am now beginning to take 50mg of Toprol as prescribed by my new cardiologist.
I was wondering how effective Toprol is in relieving the symptoms of IST and whether or not it leaves you fatigued like the Atenolol does. I've only been on it for two days. Also, is this medicine something I am going to have to take for the rest of my life? What is its effect on pregnancies? How serious is a diagnosis of IST? Should I be sent for a tilt table test? I've noticed the similarity between POTS and IST. Have been looking for someone to compare notes with on this. I'd like to hear your thoughts. I have noticed a huge negative effect on my quality of life, so I am anxious to get on the road to better health!
Thank you for your help!