No assimilation of Calcium, Vitamin Bs, Magnesium (which can affect your heart), increased broken hips...
In summary, I would not worry for the interaction with Plavix, since probably you no longer need it, I would be very worry for taking them without a clear diagnostic or reason.
If you have got a gastroscopy and they did not see the reason of your pain, chances are that you will get nothing from PPIs.
If you have not got the gastroscopy, I would get it before going on PPIs for life.