Thanks for posting your query.
With the available described symptoms, appears to be possibility of upper respiratory tract
viral infection with associated myalgia.
Myalgia (muscle ache) is a prodromal integral symptom of viral infection and body ache
could be due to associated myalgia.
You should consult with internal medicine specialist/ ENT surgeon and should go for thorough check up.
You should also go for complete blood count
, erythrocyte sedimentation rate
, and chest x ray.
There appears to be least correlation between diabetes
and your symptoms.
Meanwhile, you should take complete antibiotic therapy (to prevent secondary bacterial infection), decongestants and anti-inflammatory medicines on written prescription from your local doctor.
You should also perform gargles three times in day; a glass of lukewarm water with a pinch of salt.
Dr. Mayank Bhargava