Hi well come to HCM.
Since you are having pain as well its likely that you might have associatred infection.
clinical examination is must to see for enlargement of submandibular lymph
Sub lingual ulcers or any other oral infections . Headache could be in inrelations to
infection causing fever
.You may try course of antibiotic with simple paracetamol
if no relief can consult any oral surgeon.Feeling of swallen tongue may be due to dry
ness of tongue. thanks and take care