Suggest Treatment For Dry Cough, Headache And Body Pain

I had protected sex with an unknown girl . But after 3 days got dry cough and later on next few days I got sore throat or a strep throat . I was stressed out and while thinking a lot I got headache and body pain . I did not have had any body rashes , chills or night sweats or swallon lymph nodes . No diarrhoea .no nausea or vomitting . Stress was at peak so I went for an RNA PCR Qualitative that was sensitive upto 20 copies per ml On 12 day that came out non detectable . The day I got my result than after I didn t felt like any problem. On 17 day. Is it conclusive. ?