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Materia Medica Viva Volume 3 – page 536

General weakness resulting from injuries. After every stool he must lie down. Asphyxia after injuries. Ailments from using the catheter.
Trembling on exertion. Fainting from shock in injury; from pain in heart; after perspiration. Faintness, fainting in angina pectoris; during fever.
Tendency to hemorrhages. The blood vessels seem to be relaxed and extravasation of blood is easy. Internally there is easy bleeding of the mucous membranes. Parts that are inflamed bleed. Hemorrhage is watery mixed with clots.
Body is cold while the head is hot. Has sore, bruised pain in spots. Sensation of deadness in the bruised part [injuries]. Feels numbness externally in the bruised part. Numbness of parts, suffering in bruised parts. Pulse is faster than the heartbeat. Perspiration stains the linen red.
Vertigo
Vertigo from injuries to the head. Vertigo while reading too long. As if high objects leaned forward and would fall on him. Objects seem to turn in a circle while walking. Giddiness on getting up after sleep, on moving the head or in walking. Vertigo on closing the eyes. Vertigo in old age.
Head
Arnica is full of headaches, especially if dating from a blow on the head or after a fall or an injury that caused concussion. It must be appreciated that the constitutional types of Arnica will develop such headaches very easily, as this remedy is exceptionally sensitive to the effects of blows or falls where a concussion results in chronic symptoms, whereas in other constitutional remedies we do not see such sensitivity. The headaches of Arnica are characterised by angiokinetic disturbances where we observe heat or coldness in different parts or spots of the head. Whenever a headache is accompanied by such concomitants as coldness or heat in spots or parts think of Arnica. Also if you see contrasts in body temperature like: "burning headache while the body is cold". Headache which feels as if a knife was cutting, darting and stabbing the head followed by a sensation of coldness.
Aggravation of headache in forehead, above eyes, from the heat of a stove. Head feels cold and chilly after breakfast. Head is cold and chilly internally.
Vertex of head is icy cold. Feels coldness and chillness on his forehead, as if a cold finger were touching him in certain small spots. Heat in head during cough. Has stitching headache in forehead, during chill. Heat in head while lying down. Head is