Covid advice

I tested positive for covid. I was so safe the entire time and I honestly have no idea how I tested positive. I’m around no body. I’m so annoyed and mad at myself. I got my second covid shot back in June. Just tested positive today. I feel like complete shit. My whole body hurts. I feel horrible. Anyway, I’m wondering if anyone has any tips on feeling better. Obviously i know it takes time. Other than drinking water / resting anything else I should do? What are warning signs to look for medical help?