i currently have had a so called viral infection for 1 month. it started like flu and left me in bed for about 2.5 weeks. it then developed into severe fatigue, muscle aches and weakness. i am now in week 4, a bit stronger than before but i now have a tightness in the chest and some white phelp which comes out. i also have something which feels like a head cold, slight heaby breathing, still some muscle aches and general weakness. i have had all the blood tests and all was good except slight anemia. i wasa given antibotics by my doctor as he thought i developed a secondary infection which was bacterial. however, the medicine did not suit me, another doctor from the same surgery advised that if i am getting better then just rest and drink water and you should get better. my main concern is that at night, i get slight chills and also slight sweating which i can feel on my chest, neck, back and under arms

please advise what this could be? many thanks