Doctor?

co
I've been getting sore throats once a month for roughly a year and I've gone to my doctor and they say I don't have an infection and that it will go away but it didn't so I went back in and got a blood test for mono and that came back negative(that was last month)
And now I have another sore thought but I'm also coughing up phlegm and my voice is hoarse and I've had it for 4 days should I go to my doctor?