13 year old female here. I've had an on and off cough for a few weeks/months. I went to the doctor and got some cough syrup and an inhaler. Last week I had sore and stiff arms. This week I have a terrible cold (Runny nose, sore throat etc). It doesn't seem to be getting better. Please help, I've tried cough syrup, inhaler, cough sweets, drinking a lot of water.