From Longman Dictionary of Contemporary Englishviolent headache/fit etcviolent headache/fit etcMIa physical feeling or reaction that is very painful or difficult to control → violent
Examples from the Corpus
violent headache/fit etc• He still paid with violent headaches, but it could have been so much worse.• A violent headache can be safely dissolved within minutes without having to resort to aspirin or paracetamol with their accompanying side-effects.• They were both attacked, one having a violent headache, the other being possessed as I now realised I had been. 