I'm going to move out from my girlfriend's house because of her anxiety and medical problems
Do you think that is for the best? Do you have a place to move into?
I think I'm going to move in with my parents because I want her to have a quiet place to manage her mental illness.
It is understandable that caring for someone with mental and medical problems is difficult but you should talk to them before moving out. Maybe there is another way to resolve the problem instead of moving out.
I just think this will help her
You need to speak with your girlfriend about this before you make any actual hard set plans. She may disagree, and if she does then you could be in for a very annoying fight which I am sure you want to avoid.