Suggest Medication For Back And Leg Pain

Hi I m Jennifer, female and I m 15 years I ve had leg and back pain for 3 days now my legsmostly a sensation of wanting to numb out I feel like shaking it half the time haha but my legs always feel tired and I always feel Like sitting , for my back I feel like I have a bruise on my left upper side closest To my lower shoulder and my back just feels achy and uncomfortable. I had fever A day ago and felt super cold in school and at home even though I had two blankets and A heater. I also have a cough, coughing out boogers and a runny nose, I tire very easily As well, please help I don t want my parents wasting money on the medical bill!