Below are the main rubriks (i.e strongest indications or symptoms) of Belladonna in traditional homeopathic usage, not approved by the FDA.
Sensitive to least contact
Much throbbing and heat
Palpitation reverberating in head with labored breathing
Boring of head into pillow; drawn backward and rolls from side to side
Pain; fullness, Especially in forehead, also occiput, and temples
Headache from suppressed catarrhal flow
Pain worse light, noise, jar lying down and in afternoon; better by pressure and semi-erect posture
Hair splits; is dry and comes out
Headache worse on right side and when lying down; ill effects, colds, etc.; from having hair cut.≡ more ...