One thing that going alone might help with is "perspective" - you've been dealing with such a bombardment of negativity during this time of grief - I can tell you from experience that it would probably be a huge relief for you to get out of that negative environment and into one where you will find life, roots and perspective - and all of that will then help you to go back into your Mom's environment refreshed and rooted in what you gained from the journey.
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)