Dad had a stroke jan, in hospital they done vascular scan neck lack of blood going to brain so had op he now dizzy alltime an got lump ribs by breast?

Complicated. Carotid surgery doesn't generally cause dizziness but his underlying cerebrovascular disease might. Strokes involving the cerebellum (which is not supplied by the carotids) cause intense dizziness. I simply cannot think of anyway that carotid surgery or stroke would cause a lump on the chest which seems to be a separate issue.