Fast heart rate awakening me from sleep nearly daily after 2 hours of starting sleep, a holter recorded one time as 173 BPM, normal echo, TSH, CBC?

SVT. A heart rate of 173 at rest (while you're sleeping) is not normal. You should be evaluated by a cardiac electrophysiologist, especially if this continues to occur. There are other arrhythmias that this could be that are even more serious.