Teacher, cancer and shielding?

Hi

i wondered if anyone had any advice? I was diagnosed with breast cancer last year, I had chemo which finished in jan, mastectomy end of jan, radiotherapy in April and just finished herceptin. I am a teacher in a large secondary school and we've had many confirmed cases within school both students and staff. The advice on shielding being paused means I am expected to be at work but it doesn't feel sensible after shielding since March. Is anyone in similar situation? What are you doing? Thanks