I suddenly had a strong pain in my left arm, then shoulder then left side of my neck a bit like doing bad movement. pain disappeared within minutes. ?

Be careful: Particularly if your pain came on with effort and was relieved with rest, you must consider this to be heart pain until proven otherwise. If you have a high cholesterol, diabetes, known heart disease, high blood pressure, use tobacco (one or more), go to your doctor as soon as possible.

Possibly cardiac: Pain could be due to heart attack. It's absolutely worth seeing a physician immediately depending on your age (>25). You should have an immediate ecg, which can tell if your heart is affected. If the ECG is normal, you could still be having a problem with your heart though.