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Difficulty in getting the picture could be due to crowded ribs (no place for the probe), hyper-inflated lungs and so on. A look from another place will solve! An X-ray chest may show the reason.
of 200 in short effort is high - you need further assessment. HOLTER (24 to 48 hour ambulatory monitoring) / ECHOcardiogram
/ TMT (Treadmill exercise ECG) / LABORATORY work-up – may all be necessary for further assessment and assistance. The treating doctor may suggest them depending on need, based on his assessment of the situation.
Wishing speedy recovery