Try to take one day at a time, remember the good times and you did your best to try to save her. There is no time limit to grieve, and time and unforseen occurences happen to good people as well.
Stay busy and reach out if your feeling like you need to hear something encouraging.
Am certain it feels like a hole in the middle of yor chest, but it will slowly subside with time.
Will be thinking about you.
Simon C