I'm so sorry for your loss of your mom. I lost my mom too, as well as my two older (and only) sisters, to addictions and their sicknesses. I know how badly this hurts, and how everything seems so incredibly screwed up right now.
The folks above me are right. It does get easier with time. I don't think this is the kind of loss that heals entirely...at least it never has with me. There are some days when I just about come unglued, thinking about everything that I miss about having a mom and sisters. But it has gotten a thousand percent easier as time has gone by.
If you're into books at all for healing purposes, think about finding "the loss that is forever" at your local library. It's specifically about healing from the loss of a parent, and I know it helped me a lot even years after the fact.
Sending you light, and life, and strength to get through this with your sanity and well-being. Hugs too.
GiveLove