Thanks for your query.
shots do not cause the symptoms described by you. In case there has been news of something wrong with the injection lot then you certainly need to consult the hospital where he received them.
and the experience following that can certainly disturb a child. This, too, can be the cause of the behaviour described by you. It is always better to seek the treating doctor's opinion.
I hope I have answered your query to your satisfaction.
Wishing your grandson all the best...