I convince myself I’m a horrible person

I’m not the best person and I’m able to admit that, I’m in therapy working on it as well, however lately my anxious episodes have consisted of me convincing myself I’m a genuinely evil person who has done genuinely evil things. I haven’t, but what if I have and just didn’t realize? That sort of mindset. It’s so scary because the guilt I feel is so real so it’s hard to tell what’s real and what’s not sometimes. It’s just so scary and stressful and I don’t know what to do. I don’t know how or why this even started but it's been terrible.