I know this situation so well... What helped me was to first start doing household chores, at least a little at a time (once you start, it becomes easier to continue). Then start going out into the fresh air for at least an hour a day and allow myself not to think about what scares me so much. And then at some point just grit your teeth and stop putting it off. Just get it done, despite your fears, and don’t let yourself dwell on it any further.