People often insult me and spread fabrication about me to others. When I think about it I get stressed and it makes my OCD worse sometimes. Do I defend myself or just stay quiet and leave

If what they say about you is a lie, then say plainly to whoever it reaches that this is not true, and clear yourself. You are not obliged to stay silent under a fabrication. Also make your health a priority and do what is best for you. Visit doctors when you need to.