At the time I was almost numb. I was sad, but not as sad as you think ahead of time you would be in a situation like that. It was only with the distance of time that I realized how depressed I must have truly been.
I don't know how old you are, or what else you have going on in your life, but even if you think people can't help you, surrounding yourself with people that care about you is vitally important. I don't have any great insights other than to invest time and effort into the relationships with people who care about you and whom you care about.
In time, the loss of my dad has become a part of who I am. If there is one positive outcome it is that it has certainly helped me set priorities in life. I realized through that experience that possessions, money, promotions, career, etc... all the things that we think are important are so meaningless in the grand scheme of things (though it's shockingly easy for me to get complacent and forget this lesson). People are what is important. Love and caring for our families and friends is one of the only things we have that transcends time and space to make a difference in another human being.