Slapped on my ear a few weeks ago....doctors advice please, or past experience.?

If you want a second opinion go to outpatients at the emergency room and see an ENT specialist. It's not good to pop your ears unless equalising pressure when at heights or scuba diving etc as it can cause damage, so I'd really try to stop that habit, especially after receiving an injury because of air pressure, (due to the idiot that slapped your ear) in the first place.