coughing for a month

Ive been coughing for a month. I first got sick in april when i drank from the school water fountain then I recovered a little then I had a fever on my friends birthday june 2nd and i was so sick during finals it was death , I then kinda recovered on graduation june 12, Ive coughed everyday and all the medicine I took like thermaflu, nyquil/dayquil and robitussin only helped for a while and i go through each bottle like nothing. I thought I would be fine for like 2 weeks but Im still coughing