Sorry to hear about your mom. It's really tough.
I lost my mom earlier this year to sepsis. Christmas eve last year she was complaining about having the flu or something and how she was going to skip christmas eve dinner. I got a call around 3am christmas morning that she was in the ICU in a coma and she never left the hospital, passing away on Jan 8th of this year.
It all stemmed from a bug bite on her leg that she kept scratching and got infected, then it traveled through her blood.
I know the holidays are especially hard, but hang in there. Your mom would have wanted you to enjoy them.