To protect my heart I find I'm distancing myself emotionally since the future is uncertain. When I visit at the nursing home I get so depressed when I leave and I feel like I'm already going through the stages of grief. My mom is actually starting to adjust to her situation. I however am not.
What is positive is that your Mom is adjusting to the nursing home... that is good news.... now you need to adjust having her there, instead of being with you. She's in the right place :)
Be positive...it takes just as much energy (as being negative) and has many more benefits...less stress on you; less guilt, etc.