What causes a momentary sensation of tightness from the collarbone up the neck up to ears followed by sensation of lump in throat? pcp says heart ok?

Look inward: It could be any number of things, but if there are no abnormal medical findings and I were a gambling man, I'd bet on anxiety. Next time, think back about what *immediately precedes* this sensation (whether an external event or internal thoughts and feelings) and see if you notice a connection. Try *psychotherapy* (talk therapy aimed at understanding and insight), not just behavior therapy.