I'm really sorry to hear about the anxiety you're experiencing, but it's completely understandable given the situation. First off, remember that you're not alone in this journey. It's completely normal to feel overwhelmed, but remember, you're taking a positive step towards healing. Taking a deep breath is a great start – try focusing on the positive aspect that immunotherapy is a step forward in treating your stage 2 thyroid cancer. Surround yourself with supportive friends, family, or even a support group to share your feelings and fears. Seeking guidance from a mental health professional can also be beneficial to develop coping strategies.