I love my dad and I'm happy he's back. I don't understand why I'm still crying? (please read)?

March 5, 2005, otherwise known as the worse day of my life. I was 10 and me, my mom, and my dad were driving home from a birthday party for a family friend. We were driving down a dark street and out of nowhere, this other car came. My dad was driving and he swerved out the way and hit a pole. Me and my mom were hurt a little, but my dad wasn't responding. After we were rushed to the hospital, the doctors explained that my dad hit his head and was now in a "deep sleep" (coma). That was the day my heart broke. My dad was the greatest dad ever, and I know every girl says that, but for me its true. He did everything for me, I mean, I was his little princess. We were extremely close and after that, I wasn't the same happy kid I used to be. The doctors told my mom that it was possible that he would wake up, but they didn't know when or if for that matter. We visited him usually 3 or 4 times a week, every holiday, birthday, anniversary and I usually went to see him if my mom and I were fighting or just when I felt lonely. My mom always told me that he's still in there somewhere. Most times, we would just talk to him. Sometimes I would just look at him and cry or hold his hand. Seeing someone you love in that state is pretty emotional. I just missed him so bad. There were days when I would sneak into their room, take of his shirts, and just hold it. Like it was him, you know? This morning, my mom came to me, crying, saying that dad was awake. I couldn't even believe it but he was. Its so weird that I'd been nervous to see him, when I just saw him like 2 days ago, comatose. I didn't even want to go into his room, I was so scared. My mom ran in and they kissed (ew I know) but there he was. His normal sweet self. Like nothing had changed. He was kind of unprepared to see me now 16 and he cried, I cried, we all cried. I just talked to him all day about me, school, life, basically. I didn't want to leave him, but visiting hours ended at 8. Doctors want to make sure he's alright but they say he'll probably be home by next week. My mom now wants to throw a big party for him, but I can't even process my emotions. I'm so happy, but so sad and I don't know why. 6 years, I've been waiting for him and now I can't stop crying, even now. I love my daddy so much but I'm so sad right now. I don't want to kill my mom's buzz so I haven't shared my feelings. I don't get it. What's wrong with me? Why am I so sad?