My Flu/cold Virus Just Wont Fully Go Away. I Have

My flu/cold virus just wont fully go away. I have been ill off and on for 2 months now even after taking a 10 day antibiotic treatment with probiotics.

The cough, phlegm and high fever come and go. I was practically bed ridden for an entire month. Then 4 days ago I felt good. I went walking outside and when I got back home I fell deathly ill and my body ached and the fever came back high crippling me and I started coughing again...