How to deal with the energy of Fear?

I have been meditating for quite a while now. I practise mindfulness as far as possible. I no longer brood about the past or fantasize about the future (except occasionally). Now a new hindrance has popped up that is affecting my meditation as well as daily life. I experience this debilitating energy of fear around my heart. This fear takes form of thoughts. Although knowingly I don't create these thoughts. This energy of fear scans through my mind and creates thoughts which then perpetuate this fear energy. To tell you an example. In the past I was not a very good person, I was egoist with superiority complex and have hurt many people.Those people in turn have taken revange and hurt me. Now I don't harbour ill will against anybody or I am not angry at anybody knowing fully well that it was all my own Karma.I don't brood on this past anymore. The energy of fear pops up now and then and brings in to consciousness the memory and image of these people who have hurt me and tell me that they are going to hurt me again. This is all in the imagination. I can do with the associated thoughts. I can be mindful of the thoughts and let them go. But I don't know how to deal with the emotional energy of fear. This is affecting my life and my meditation. This has been so for the last 1-2 months. In my online research I read that fear is there because of desires. That we are afraid that our desires wont be fulfilled and so we fear. But that is not in my case. I don't have any particular desires (sexual or otherwise). Currently, I listen to the Ratana Sutta every evening and do mantra chanting with the monks (on YouTube). I feel ok, but haven't gotten over the energy of fear. I have also tried doing Metta Meditation practice, but it makes the situation worse as the thoughts and emotions not only persist but are amplified. I don't have any illwill against anybody, so I don't want to create Metta towards anybody. I just want this fear emotion energy to leave me. I want more of equanimity rather than loving kindness. My question is how do I deal with and let go of this energy of fear. Is there any meditation practise to deal with such situation?