Hi ! Possibly you have got an oral infection post deep gum cleaning which has spread to the tissue below your chin ( sub mental area). This has given rise to the swelling below your chin and there could be associated fever
which might be responsible for your headache, body ache
. It is not possible to exclude an abscess
of the area without a clinical examination. I would suggest you to see a general surgeron/ENT surgeon to exclude any infection and abscess developing in your sub mental region.
Wshing you an early recovery.