How about this? I'm thinking of moving away from my kids due to my mental health.
Oh, what? For real? Why do you feel that you have to move away?
My husband and my kids take good care of me and I don't need to do anything. I get to feeling bad.
It's understandable that you want to take sometime for yourself if you are not doing well mentally. It's best that you do not put your kids in an uncomfortable situation that they would not understand.
Do I need to feel guilty if I stay?
No you don't, but I worry what your kids will think if you move away. Stay together and let them do what they can for you. Why not just help out on your own for yourself too?