Toprol-XL and have realized that

Well I been taking toprol for a month and a half, I have realized that its helping me so far! For the last 4 years I been having this flutter in my chest, heart racing, and chest pains. I go to an emergency room, they tell me, "Oh your having an anxiety attack", and I just knew that something was going on, because the way I felt. So, now 4 years later, I'm diagnosed with SVT, a type of Arrythmia. The only time my blood pressure goes up is when my heart races, other than that its not high at all. How they found out I had SVT, is while I was at the ER, they caught it on the monitor. I'm hoping that this medication will help me, so far so good. Sometimes, I do get anxious, but thats a part of the anxiety I think!? Only thing I have noticed is when i go to bed, I am asleep, and the next morning I feel like I been beat up while sleeping. I'm restless.