My left arm is hurting it feels like my vein s gonna explose. It started 6 hours ago. No swollen?

Painful arm. May be clot in artery ( cold) or vein , may be musculo-skeletal tendonitis or may be from cervical disc ( numb tingling , decreased strength) but would go to ER to evaluate. Motrin may help but still need to assure that it is not clot therefore go to ER .