I know students have to learn but......it seems to take a long time to realise the practice object is sentient, not deaf and may grant the student greater knowledge than he/she has. You can take your specialist’s advice and stop worrying but, as he/she will know, test and scan anxiety is a real thing, and you have already had counselling, so easier said than done! Or try and have a mammogram as soon as possible, which should be possible if your specialist recommends it (for your peace of mind not because his/her assessment is wrong). After all, your specialist presumably allowed the student access! Best wishes.