Symptoms:
Sudden feeling weak, right arm turned blue for few minutes, extremeties cold for next 8 hours. Lower back pain for previous few days with headache.
ECG clear
Echocardiograph clear
Vascular scan left arm and heart clear
CT hear scan clear
Blood tests clear
Urine clear
Normal temperature
Normal BP
Normal Pulse

Sudden feeling unwell is accompanied by fuzzy warm head feeling followed by cold extremities.
Symptoms now 7 days and continuing.