I'm really anxious because I've had breathing issues, a cough, and a sore throat for 90 days now. I got tested for Covid three times, and all came back negative, which just adds to my worries. It started suddenly on March 18, and it's not getting any better. Even after testing negative in May, I'm still struggling with breathing problems. This is making me really scared. Can you recommend any medications or advice on what I should do?