Lurkings ma puce,
This is really hard. Sometimes life is like this and difficult things just pile up. I have lost a lot of loved ones, but not in a way you describe, so close together. I laust my favorite aunt suddenly last year and a good friend and old lover hanged himself 2 weeks later because of financial problems. I do know the feeling of not being able to deal with more.
The best way is to go through each day one day at a time, sometimes one hour at a time. You´ll get through it and finally things will clear. Juls is right about new friendships developing. I have a saying that each time we lose someone the gap is waiting to be filled.