Vibrations in left chest area

[graceanna1]

For the last two weeks, I have been experiencing a form of vibrations in my left chest.  It happens off and on, but it has become more frequent.  I do work out with a trainer and the last couple of weeks we've been doing more upper body workouts with pullies and weights.  I've stopped the training this last week, and I still feel very uncomfortable.  The vibrations cause me to feel irritable and shaky and I've become very tired these last couple of days.  It could be the stress of not knowing what this uncomfortable feeling in my chest is!  I don't have pain or shortness of breadth, but I do feel like taking deep breaths and working out the vibrations to make them stop.  Should I give it more time, or start going for tests!  I'm hoping, of course, that this is nothing to worry about.  I need our advice.