Left jaw neck shoulder arm pain past few days. dr did ekg it was normal. echo scheduled. he thinks muscoskeltal. tmj tight scalenes? other causes?

Doubt cardiac: you need to get an a valuation of the musculoskeletal problems. Your physician can have you see a rheumatologist or an orthopedic surgeon they can better clarify your discomfort

Nerve Impingement: can be caused by nerve being sandwiched between two spinal bones in the neck area. It can cause muscle spasm and pain in the neck. This condition must be professionally managed. See an interventional pain management specialist or neurologist for definitive diagnosis and management.