Well firstly, my deepest sympathy, I know that comforting might not do any more good but well.
Firstly, you can't help it if people pass away, it's not like you can drag them around going, "Nooo!! You can't diee!!!". I don't think so. The positive thin you can think about this is that at least you seen them before they died, at least they probably have seen you before they die. True seeing death may not be a good thing; ok, you may feel helpless just looking at them dying, again, the positive thing I mentioned you can think about.
Start of 05 may not be brilliant, but hey, who knows what would happen next. Such atypical things happening at the beginning does not determine what happens next. Personally I believe that you suffer first and enjoy the joy afterwards and would cherish them more because you know that good things don't last and after all the suffering, this cheerful time will taste even sweeter.
What I've said might not have helped but all that matters is that you need to think through it. I've been through the "not worth living" thing many times, but endure it and just...live on.
And you can have a hug and a bag of cookies