Sounds likely to be flu with the aches and pains, and chills would suggest fever, which usually comes with viral infection which runs it's course in time. However, if someone's immune system is compromised, asthmatic etc, flu can hit harder so worst cases can need hospitalised.
Usually not a lot the doctors can do for viruses, other than prescribe stuff you can get at the pharmacy, so a visit to doctors within the first week of any cold type bug is most likely only to spread the virus to others and use up appointments that can be hard to get hold of.
The NHS guidelines are not to prescribe antibiotics (to prevent resistant bacteria evolving any quicker than they already are) unless there are sufficient symptoms to suspect a bacterial infection or culture of sputum etc. and generally this requires at least a solid green coloured sputum or a cough persisting beyond 7-10 days without a fever before they start looking for bacterial causes.
The pharmacy is a much better bet, they can provide expert advise, cough syrups for a range of types of cough, antipyretics such as paracetamol for pain and fever, and my personal favourite for a sore throat is ultra chloroseptic throat spray, which has local anaesthetic to really soothe the pain, along with a traditional hot toddy or hot water honey and lemon, and breathing in steamy baths with a drop of eucalyptus oil.
Hope you all feel better soon.