Irregular Heart beats/fatigue

I wore an event monitor and it showed that I have Tachycardia. Did all the tests and my doctor told me that I don;t have blockage, but he can not tell me why my blood pressure is low, fatigue, feeling that I can't hold myself up when standing and a heart beat that will take off for no reason. It wakes me up in the middle of the night racing to 97bpm. He told me not to worry but I was so active before and now all I want to do is sleep. What can you tell me?
Thanks

[Momto3]

A normal heart rate is said to be 60-100.  Did your event monitor show true tachycardia, or just a heart rhythm that is faster than what you're used to?  Did the doctor say the tachy was a problem?  You may want to talk with your family doctor to see if he/she can help you determine why you are fatigued.  Perhaps some blood work would be helpful.  

[chennen2]

I recommend getting a second opinion.