What, if you don't mind my asking, happened to your sister? Always remember that time heals all wounds. You're in the grieving stage right now, but as time passes, you'll still miss her but remember the good times, too. A boyfriend of mine died in a car crash running an errand for me, and I still feel guilt about it, but I know he wouldn't want me to. Again, please keep in mind that you're going to go through stages until it's resolved in your mind. You're in my thoughts. Take care.