hello and welcome, the pain is due to the incomplete removal of vital pulp within the tooth.the pain aggrevates due to the presence of temporary filling given. if the pain is unmanagable,remove the temporary filling.please visit your dentist at the earliest.ask him to extirpate the pulp in coronal and radicular area completely,. if the pus and blood has to drain out still from the tooth,its better to give open dressing for the tooth.take metrogyl-400mg,thrice daily for 3 days,to reduce the infection and swelling. in the second visit,biomechanical preparation has to be done.in 3rd visit,obturation with gutta-percha cone has to be done followed by crown.obturation should be done only if the tooth is completely healed. hope you get well soon.