If it hurt 'like getting hit' DURING the dive, it's either a, hood squeeze or b, poor equalizing. Both of these mean you should change your dive habits a bit.
If it hurt AFTER diving, then you may have trapped water in the ear, or an infection.
In any case, something like Doc's proplugs (vented) i've found to be useful - Specially in colder water like the UK. Very small, easy & cheap. You can fill your ear with fresh water, then plug them with the proplugs, or let them fill with seawater on their own once you begin diving.
Lots of divers swear by things like a few drops of olive oil in the ear post-dive sesh. This will help with trapped water, and (possibly) help with mild infection.
Otherwise check with a doctor who knows about diving - the inner ear's very fragile & close to lots of important, cool bits of anatomy.
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