It's not clear to me whether the root canal was completed.  In any
case, it is extremely common to have tenderness to biting pressure after
a root canal is started or completed.  This generally diminishes over a
day or two, though it can sometimes linger for a week even in the
absence of problems.
    It is important that the bite on any filling is properly adjusted, as a
filling that is too high may also cause pain.  This will necessitate a
trip to the dentist if there is a problem in this department.
    Monitor the symptoms.  They will likely diminish soon.

Steve