I have a loud cracking sound in back of my head several times a day, not with any pain. I have had a dull headache for about a week solid with a nauseous feeling. I had a severe headache, which I should have gone to the ER for, but I was in too much pain to get out of bed. I don t usually get headaches, as a rule. I don t feel right everyday now for the last 10 days