I do not believe anyone really stops being afraid completely. I am still afraid to lose people. But, it is a fact of life. Even back home, I had a dangerous life, and losing people was a constant risk. We could not dwell on it. We had to keep living and doing what needed to be done.
[Perhaps it was the lack of things to do here that made it so easy to fall into this kind of rut, though. Tieria considered that.]
Have you considered trying to take up some activities? It will not erase your feelings, but it may distract you enough to prevent them from being in your thoughts all the time.