Lori, this is completely normal. I never went thru anger, but some do. I have made piece with God over this. My husband died in July and even today it is normal when I reach to touch him when I first awake. All I feel is my dog & then that scares me.
I am sure you & your mom are just in the grief process. Take deep breath & keep trying to get past this. Each day is a new day and somewhere down the road you will get over this. I have bad days too. I will pray for you.
Blessings,
Fancylady