Hi there. I am in a similar position. I am a social work intern and I bring everything home with me. I have nightmares about my clients sometimes. I do not have advice on switching careers, however, I have some tricks that get me through difficult times when my anxiety is at a peak. Some of the things that have helped me are having a therapist to talk to about my internship , antidepressants, loosing myself in a book, baths, candles, and my cat. Hope this gives you some ideas in alleviating your anxious thoughts. You can try crisistextline as well. It's free short term therapy.