I believe that these energies do exist but feed on our fears. If you are scared and think of these energies and entities they will appear. We can create what we concentrate on and if you feel that is part of your life it will be.
To reduce your fears, know and believe if possible that you are in a safe universe that has only love for you. Call on your ancestors and angels for protection and call a protective white energy sphere around yourself to lock it out. There are many YouTube videos on protecting yourself from negative energies. I have offered my services for free in the healing section if you like. I have had very similar experiences and felt under attack in the past but when you realise you are part of it and there is no external power it all disappears.