Why do I feel very uneasy sometime?

Tweet

Sometimes, I feel very uneasy about my life. Currently, I work far away from home, so I cann't look after them. Sometimes, I heard from my mother that they were sick several days before, but is OK now. I just listen, can I do something on the very time? Currently, I work in a company. I likes my job. But for some reason, I have to quit my job and prepare to join Graduate Entrance Test. If succeed, no regret for me and I'll begin a new life. But if fail, I cann't imagine how are the following years? Currently, I'm still single. It seems to be the most important issue I have in my mother's point. I don't like to marry somebody in a hurry. What should I do now? I feel very worried these days.