I'm 32 and an only child to a single mom who is getting ready to pass

My whole life it has been just me and my mom. She was diagnosed in august of 2013. This week will be her last week with me. Although I am an adult, I still have the overwhelming feeling of becoming an orphan. I know I am not the 9nly person to fall into this catagory but I'm feeling very alone. My mother is who has always rallied behind me. I could tell her anything no matter how embarrassing.  I could ask her any question without feeling stupid. She always had great life advise. I just don't know where I will turn in the future. I know there is nothing I can do for her now but make sure her last wishes are met and make sure I live a life she would be proud for her only daughter. Our last real conversation, before the onslaught of medication, lasted three hours. We laughed and told stories and learned new things about eachother even after we thought we knew everythi mg there was to know. She is heavily sedated on medication now and will remain that way until it's her time to go. I don't want her to have to ask for anything. I feel alone. Absolutely alone. Ive got great friends and wonderful support, but I just want my mom. Sounds kinda pitiful and selfish. I miss her already.