I believe that you just stop being. I don't think there is really anything after. Once you're dead, you're dead. I don't fear dying since I will be dead and probably not really care. I only fear the painful way in which I might die. The only other thing about death I fear is the loss of a loved one.
As for my experience with death I am a firefighter and deal with it on a regular basis. I have ran calls ranging from people who died of old age, illness, car accidents, and random accidents like being kicked in the chest by a horse. I have also dealt with suicides, self inflicted gunshots, people laying on railroad tracks and overdoses. It sucks sometimes, but it is part of the job and you have to try and distance yourself from it. If you run a call on someone and they die you can't dwell on the family's grief much (and trust me it is hard sometimes) because if you do it will slowly tear you apart inside. Then it will most likely lead to depression and then possibly your suicide. Worst way in that case is to fall into the whole "I could have done more" ideology of 'maybe if we just kept doing CPR for another minute or two'. That way of thinking takes you down hill fast.