Can't add much to the wise words before me. Your honesty in posting and therefore the ability to let yourself be vulnerable sure sound like you are on a healing path. Really glad you are reaching out and getting the support you need. The struggle with depression sometimes is the feeling itself makes it feel hopeless to bother.
Based on the first sentence of your post, you may want to think about some Vitamin D3 through these cold, dark months. It's made a huge difference for me.
Glad you had a nice holiday with your family and treasured memories of your mom.