Hi welcome to HCm
I have gone thru your query regarding painful pulsating on collar bone after doing intense cardio exercise , is indeed a matter of concern .
Dear , for your info , our body works well ,till it is not broken and repaired .
A repaired part , that too with a metal plate, can 't tolerate jerks of increased amount of intense cardio exercise so ,you face painful pulsating and other problems .
The strong immune system , which is helpful for our disease free total health , is incredibly complex because your body has many lines of defense to rid itself of foreign invaders.
Modification in your life style , food habits , with required work out ,
Yoga , pranayam deep breathing , are the piller of our strong immune system responsible for healthy disease free life
Be careful , not to indulge in heavy workouts which may harm you further .
To give resistance from diseases & alley pains take a level spoon of turmeric powder with hot Milk + a spoon of almond oil , at bed time .
Lemon juice with water , a pinch of salt and pepper before meals .
Aloe vera juice + Amla
It is suggested to consult your doctor for proper guidance if problem persist
Hope this helps solves your query .Take care .All the best .Get well soon
Don't hesitate to come back in case of any further query .