The word for today is…
compunction (noun) – 1. A strong uneasiness caused by a sense of guilt.
2. A sting of conscience or a pang of doubt aroused by wrongdoing or the prospect of wrongdoing.
Source : The Free Dictionary
Etymology : Mid-14th century, from Old French compunction (12th century, Modern French componction), from Late Latin compunctionem (nominative compunctio) “remorse; a pricking” (of conscience), noun of action from past participle stem of Latin compungere “to severely prick, sting,” from com-, intensive prefix + pungere “to prick, pierce,” related to pugnus “a fist”. Used in figurative sense by early Church writers. Originally a much more intense feeling, similar to “remorse,” or “contrition.”