what will u do if u got to know that some of ur friend is gona die anytime:(…n u cant do anything abt it ?
i scare myself… i scare others.
i dont know how to exsplain 
…
Fear of loss you mean?
There's no easy way, none whatsoever. Just try to spend as much quality time as you can with them, making the most of the time they have left, keeping them happy, etc. Being scared is natural, just learn from it because it teaches you that life is very short-lived, and you never know when you may have to go. Try to become a better muslim, a better person. Above all, find comfort with the Allah Ta'ala, and pray that you may find peace in all of this. Best of luck.
I can't begin to imagine the pain, fear and confusion you are going through, and I really do wish to offer my support or any form of consolation, but I'm afraid I really don't quite know myself what to do in such a situation (and clearly everyone else is here is feeling the same way). It's a trying time for you, for your friend, and for all the people around your friend who care about her/him. Before you can do anything else though, it's important that you yourself are able to accept this and realize that there's a time for everyone as Allah swt wills. We're all human, limited and powerless against destiny. What you can do for your friend now, though, is to try to offer as much of yourself (your time, your presence) as possible, and try as hard as it may be to resist breaking down when you're around them - do happy things instead. Take them out, and if that's not possible, get all your friends together to hang out with them, chit chat, play games, watch movies and stuff. Be compassionate, urge them to say what they want when they want and try to avoid acting as added emotional weight on them. Pray.
Sehar baji yep true..there is no easy way..but u also have to remember...life is very short
and one day we all have to part Inshallah...so whatever the remaining time, just try to make the best out of it...and don't think about losing them so much that u forget to have fun and not enjoy the time that u have with them...it's life..stuff happens..everyone has to go one day...pray for him/her and may Allah(swt) bless u with strength and sabar and bless ur friend with the happiest moments/times remaining the time he/she's here..ameen sum ameen
rest Allah(swt) knows best :)