Kindly get an X-ray
done of the tooth
. May be you will have to get root canal treatment
done followed by a cap/crown. May be that you have gingival pocket between your teeth
where you may have pain because of food lodgement. In that case kindly get scaling done and use a gum paint twice daily for 15 days. Also get the caries removed from the tooth having hole which is a cavity and get the cavity filled with a tooth coloured restoration. Brush your teeth twice daily using correct brushing technique to maintain your oral hygiene.