One summer I took my family to Pike's Peak in Colorado. Our van had a wonderful compass to tell us which way we were going, and that compass had helped us a lot up to that point in our two-week trip.
The road up to Pike's Peak is full of sharp curves, switchbacks, and steep drops off the side of the road. Along the way up the mountain we noticed that the compass was desperately trying to keep up, but by the time it caught up, we were already rounding the next curve, and it was suddenly displaying the wrong direction.
In some ways, the grief process can be like this. There are various "stages" of grief, but a grieving widow(er) will move back and forth through these stages at unpredictable moments. Our mental compass cannot keep up with the curves and switchbacks along the crazy road of grief.
Sudden flashes of anger. Bursting into tears in the middle of the grocery store. Overwhelming and unexplainable moments of fear. Wondering if maybe this is all a bad dream and your spouse will suddenly show up alive and well. Grief brings a crazy mix of unpredictable emotions!
Sometimes we just have to hang on through the strange and unpredictable ride. I would offer you these words of comfort: You're not going crazy - you're grieving.