Weakness, Rapid Heartbeat, Rotuine Blood Work At E.R?

Rotuine blood work at E.R? - weakness, rapid heartbeat,

If you go the emergency room feeling very bad and has a problem for months, but worse, it is the routine blood tests they do?
(An answer from a doctor or RN would be ideal!)
Symptoms --
Back pain (around the kidneys)
Nausea
Weakness
Fatigue
Tachycardia / palpitations
Urine that looks different
sed
Headaches
Confusion
blurred vision
severe symptoms
strange taste in mouth, unusual urine odor
white tongue
want to start my breath away
Pain

The symptoms come and go, have heart palpitations and pains in the chest appear to be present when other symptoms. Just curious, like blood work life is ER, where they placed them with apateint.

Thank you:)