I am so sorry to hear that your Mother has passed on. Please know that she is now completely pain free & with past family & friends that have passed and that you will be reunited on the day of your passing (my belief).
Please stay sober in honor of your mother, its the last thing she would want you to do because of her passing. I lost my mother years ago & still have moments of weakness when I think of her, I do my best to switch gears & think of all of the fond memories I have of her.
Keep yourself busy & spend time with family/friends and be careful not to alienate yourself.
Take care, my best wishes are with you & your family. Your Mother is still with you in spirit & watching over you.
Here is a song that I sometimes listen to when I am hurt, hope it helps you in some way.
Take Care,
NB