Can a doctor tell the difference between svt and sinus tachycardia on loop monitor? heart rate gets up to 180bpm laying in bed

Yes: The way sinus tachycardia looks on an ECG printout or monitor looks much different than SVT and that's how we even distinguish between the two. Have you actually had a discussion with the ordering physician regarding your results or a discussion with a cardiologist so that your questions can be answered in a more comprehensive way?

Svt: it depends on the rhythm seen on loop, usually we can tell the difference ...