Unfortunately, I've been there, too.
Two weeks after I graduated from college, both of my parents passed away suddenly and violently after 2 years of divorce proceedings. My older sister was unable to live on her own before then, and was barely functional afterward. I was the new owner of 23 rental units (13 different properties, including 1 8800 SF commercial building and 4 farms > total 250 acres), 2 veterinary hospitals (with no vets, but ~5000 pets), responsible for my father's mother (who was diagnosed with cancer 1 year later), my thoughts of changing careers before graduation, my father's girlfriend who would not leave our family's home (and who was stealing our furniture, etc), my mother's boyfriend's family/estate (who was also killed in the incident) suing our family, about 12 attorneys, a few employees, 2 new cars (impounded and held 'captive' by my father's girlfriend), and now the sole (and only) person to clean it all up. Oh yeah, being a recent grad, I only had about $300, a half-functional car, and no house to live in. I had to stay with my girlfriend's house, who was family was going to be foreclosing on it soon. My girlfriend and I ended up living in her grandmother's uninsulated attic - then the water heater exploded and blew water all over our stuff one night. It took 13 months of court to get our home back (Justice does NOT occur in the American legal system - Anyone who says otherwise is completely full of ****). I was 22.
And you know what?
I made it. Class of 2013 x 7 times over.
You need to dig deep. It sucks. It really, really, really does. But you can do it. Dream of it. Focus on that. Take your time to understand how you feel. Take time off if you need it - you probably do. I found it helpful to think through it by talking about it, but to spend the rest of my time thinking about what I hoped for in my own life. If its the loss of someone you love, consider grief counseling. You'll be amazed how much strength you have and how bad it can really be for others.
Like everyone else has already said, go outside. One day I hopped on my bike and just rode. I didn't know where I was going, but I was in control. It took me 3 years after my parents died until I had all of the properties, businesses, homes, etc back in order (and my wife back in school herself) until I could start pre-med.
I also found that it was tremendously helpful in my own development. It makes you realize things that *no one else* can experience or rationalize for yourself. It made me learned who I was and what I really wanted. As for friends, expect those who were close to you before to help, but don't expect very much. I can't remember how many people who I knew that I had to almost remind them, "um...you know what happened, right?"
Good luck. You will make it and you will reach your dreams!