I think i hurt my gum with some hard food yesterday and today i have pain , but it goes even to my ear and head... i feel bad , like tired, is this normal? what should i do to fix that? i have periodontitis as well..?

Rinse your mouth vigorously with a mild mouth antiseptic . If not better best to see your dentist

If you have gum disease, are you being treated for it ?You may also have a TMJ problem or a uneven bite. See a dentist for exam and treatment. Don't try to treat this condition yourself.

Pain may be from trauma, gum disease, failing tooth, viral infection, or thousands of other reasons. It should heal in no more than 2 weeks. If it doesn't, see your Dentist.