The psychological condition of fear is divorced from any concrete and true immediate danger. It comes in many forms: unease, worry, anxiety, nervousness, tension, dread, phobia, and so on. This kind of psychological fear is always of something that might happen, not of something that is happening now.
Source: The Power of Now : A Guide to Spiritual Enlightenment, Pages: 35
Accepting means you allow yourself to feel whatever it is you are feeling at that moment. It is part of the is-ness of the NOW. You can't argue with what is. Well, you can, but if you do, you will suffer.