A week and a half later, and I'm coping.
I have good days and bad. The bad are mostly when I realise I won't see Mr Trifectagirl again, and he is not coming back. Thursday was really hard, being the one week mark and when I did a lot of the funeral planning, but I've been ok since then. I've found an online group and a local meet-up for young widows/widowers with young children that I'll be tapping into.
Working on the funeral has been hard at times, but heartwarming at others. I've learned new skills this week working on the funeral - I can do basic stuff in Windows Movie Maker and Audacity.
Today will be a harder day as a number of Mr Trifectagirl's friends are coming to help finalise funeral plans, but it will be really nice to be with his life-long friends and to hear stories.