Haven't been taking this medication very long started March 1st o...

Haven't been taking this medication very long started March 1st or so with 50mg once a day. But felt didn't need it so took it kind of sporadically the first week, every other day, then I tried just half the second week 25mg. Then I had to go back to full 50mg this past week, so basically 50 to 25mg for three weeks or so now, and I feel AWFUL. Now that I have dropped back to the 25mg the side effects have lessened but the anxiety is unbearable! My arms and hands go cold and numb. When taking it at 50mg felt very sluggish, cloudy mind, doomed feeling. It just doesn't feel right. I am only 33 years old they did a stress test on me this past Friday and 2-D echocardiogram. Tomorrow they are going to do some blood tests and a get a holter monitor put on me for 48 hours. To see if I "need" to be on this med. I dont' think I do, if it truly was something I needed or helped my body, it would help it not bother more. I truly think I may have some other underlying reason for the high heart rate, my BP has always been normal except when I was hospitalized and then once they had me hydrated and my sugars back to normal (I'm hypoglycemic) my BP went normal I just had the tachycardia off and on. So that's why the doctor in the hospital said to begin the Toprol Xl b/c it's SO SAFE I GIVE IT TO PREGNANT WOMEN!! His words. I pray for those women. After just the one week straight of 50mg when I dropped to 25mg a couple days ago it felt AWFUL to do that as well, today is much better Thank God. But can you have such strong withdrawals after such short period of time? And if so, that is scary in and of itself.