Painter, I totally understand. Family outings were one of the most difficult things for me too. I can't tell you how many times I took the kids somewhere and then cried silently behind my sunglasses the whole drive home hoping they wouldn't notice. It's hard. You build your whole life around someone and when they aren't there anymore, they leave a gigantic hole that nothing seems to fill.
It takes time to feel complete again on your own, but it will happen. When I think about H now, I feel sorry for him instead of sorry for us. He's the one missing out, and I am here treasuring every shared moment. You'll get there.