it's challenging, Leonard. I miss my mom every day and I wish things were the way they were. i want to talk on the phone with my mom, eat her home cooked meals on the weekend, laugh at her jokes, and just be around her but I cant and there is nothing, nothing, nothing I can do. I still cry almost everyday but I know I must continue. Death is a part of life and it hurts a lot when someone you love is taken from you. Celebrate your sister's life. Time will make you  feel better. the pain of loss will diminish and your memories will become your comfort. Stay strong but don't deny yourself the grief you need to go through. It's a part the human experience we all have to go through. 

hi Leonard, as hard as it sounds you have to stay strong and try to remember you are going through the process of grieving and that there is no shortcut to the process.  allow yourself to cry and feel all the emotions you are dealing knowing that it will be alright.  remember that your sister will want you to continue your life.  losing a loved one is painful my friend but you're not alone.  if you believe in the afterlife be comforted knowing that your sister is with you... just in a different way.  stay strong, Leonard.  you will get through this and eventually your heart and mind will accept the reality and will guide you, but you have to let it.  It's hard but not impossible.