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Papilloedema is caused by high pressure behind the eye, which can be from brain and also involving optic nerves. Diamox will have effect in Idiopathic intracranial hypertension
. The nausea
may not be probably due to Diamox but more because of the IIH which you have, can cause headache, nausea, vomiting
. Tell your Doctor about this and he may make dose adjustments to prevent this side effect.