Find comfortable positions to sleep. Hold a pillow against the right side of your chest when coughing. Try some over the counter pain relief meds like Ibuprofen (400mg), (maximum twice per day), stay hydrated and avoid strenuous activity. This should give you relief.

However the fact that you mentioned pain with changing position warrants further evaluation. It could be pleuritic pain. Please report any kind of shortness of breath, even if mild, while lying supine. See a doctor if the positional pain is severe, along with shortness of breath, or if coughing blood, or if high fever, rapid heart rate, skin turning blue, or if pain shoots down your arm.   If your lungs sounds are abnormal on the stethoscope, you would need a chest x ray and your oxygen saturation will have to be seen with a pulse oximeter, you might even need an ultrasound if any gallbladder issue is suspected.

If your symptoms are not subsiding over 2 weeks even after medicines. You should consult a physician

Rest, fluids

Fever, cough with sputum coming out