Even in this day and age there is no magic cure for the common cold. Take plenty of drinks and if you have a headache or are feverish take aspirin or paracetamol.
Pain is usually felt at the bottom of the spine and often comes after lifting or twisting. The main treatment for back pain is to rest and take either aspirin or paracetamol. If the pain is particularly severe or persists for more than a few days you should consult your doctor.