Below are the main rubriks (i.e strongest indications or symptoms) of Oxalicum Acidum in traditional homeopathic usage, not approved by the FDA.
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Sensation of emptiness in head; faint feeling, as if all the blood had left the brain.
Dulness in forehead (morning).
Pressing, like screwing, behind both ears.
Head affected by drinking wine.
Pain in forehead and vertex (dull, heavy headache); on l. side of the forehead on waking.
Pressing pain or, small spots.
Headache agg. after lying down, after sleeping, and on rising; amel. after stool.
Small spots on head painful to touch.≡ more ...