Yes, you really need expert help - it's almost impossible to diagnose remotely - especially if you aren't familiar with how to adjust the brakes.
It's highly probable that you might have 'cooked' the linings descending that steep hill, but it could be a leaking wheel cylinder - which will require rectification by someone who knows what they are doing.
It might be a leaking axle hub oil seal - there's several possibilities that will need the brake drum to be removed in order to diagnose the cause.
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