Sternocleidomastoid syndrome ?

I have a straight neck (loss of lordosis) and severe SCM muscle tightness. No trauma, no EDS.

My symptoms:

· Dizziness and feeling off-balance when walking/standing

· Heart palpitations and neck pulsations

· Brain fog and derealization

· Head pressure and severe neck tension

hard to turn my head both ways

Can SCM syndrome alone cause symptoms that mimic CCI? Or could CCI still be possible even without trauma or EDS?