Please stay optimistic! We are still very early in the game. A lot of these interview invites are also initial (informal) interviews with the POIs. Many profs apparently choose not to do an initial interview at all and most schools' clinical department are just starting to convene regarding formal interview invites. I definitely agree with @psychologyenjoyer, take some time away from this and take care of yourself. We're all on the same journey, feel free to reach out if you want someone to talk to.