Hello and thanks for trusting me to help you. I am a board certified consultant with over 30 years of experience.
This can be a post viral myalgia.
Myalgia without a traumatic history is often due to viral infections.
Still further testing should also be considered like
Serum Uric Acid
Chest X-Ray(P.A View)
Also in cases of electrolyte imbalance muscular pain and spasm can occur.
You should monitor your vitals like BP,Pulse,Body temperature.
Also you can use heating pads and it can help in pain management.
Steam Inhalation can be helpful in case of chronic cough.
OTC NSAID like paracetamol, ibuprofen can be taken for pain management.
Oral Rehydration Therapy can be helpful.
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Probably if your vitals are normal like BP,Pulse,Body Temperature you can wait for 3-4 days to see if your symptoms improve.
Drink plenty of fluids.
If symptoms are persistent you can visit your GP for further workup.