I think you have alot of calculous & stain deposition on your teeth. Some times these stain & calculous break automatically and patient think that tooth is break down. I think you have same situation. Because if any tooth is breaking you feel sever pain
. If your tooth is break down and some part of tooth is remaining you can save your tooth by RCT & capping. If you have large quantity of stain & calculous deposition you need scaling of your teeth. You should consult to your dentist
for clinical diagnosis & needful treatment.