If u r thinking of taking revenge from someone , like u mentioned ur enemy, then I would suggest that it's really a bad thought. Whenever a person is angry, it leads in taking a wrong decision and when u realise , its too late. Nothing can be sorted with revenge and fight. You will now take revenge from that person, if u did something serious then it will create problems for u only and also for your family . May be in the future, your enemy will take revenge for whatever u did to him/her now. If u want ur problems to get sorted then talk to that person. Clear everything. It will really help. But revenge is not at all a good option.