ἥγε
From LSJ
ὅταν δὲ τἄμ' ἀθυμήσαντ' ἴδῃς, σύ μου τὸ δεινὸν καὶ διαφθαρὲν φρενῶν ἴσχναινε παραμυθοῦ θ' → whenever you see me despondent over my situation, do what you can to lessen and relieve what is wild and senseless in my thinking | whenever you see me despondent, you must cure the grim derangement of my mind and encourage me
French (Bailly abrégé)
English (Autenrieth)
(ὅ γε, etc.): the demonstr. ὅ, ἥ, τό intensified, and yet often employed where we should not only expect no emphasis, but not even any pronoun at all, as in the second of two alternatives, Il. 3.409, Il. 12.240, Od. 2.327 . ὅ γε serves, however, to keep before the mind a person once mentioned (and perhaps returned to after an interruption), thus usually the very opp. of ὃ δέ, which introduces a new person in antithesis.
