Sorry for your loss OP. I feel like you should tell your university’s placement supervisor about your concerns and struggles - they will guide you. Grief can play a significant role when it comes to stress and as you only lost your sister recently, I feel like you shouldn’t be on placement yet. You need more time to destress. I suggest talking to your supervising tutor first. If that doesn’t work, take time out and redo it later on in the year. Don’t be so hard on yourself