"I don't think it's fair to stop development for so long"
Whoa... I know this mentality and I feel that I need to ask you to not prioritize us... Not only would your work be better if you are mentally healthy, but we are not priorities here.
Take a few months off if you need it. Take a whole year or more if you need it to feel mentally stable and healthy again. Don't think about what's fair for us while you are in such a serious and significant strain like this.
Your mom is more important. Your bunny is more important. You are more important. Take care of yourself and only work when you want; don't feel that you need to work because of fairness to us.