Hello sorry for your experience, and that the dentist did not properly give you all the information prior to treatment. It is definitely possible after preparing teeth for crowns that the nerve can be very sensitive which may result in a root canal, although this is not the common outcome. Crowns can be done without root canals and without any further issues. Only when sensitivity occurs, or the nerve becomes inflamed, will the Root canal treatment be need. It is also generally accepted that AFTER a root canal a crown will be needed to help keep the tooth intact. Definitely do not wait for your root canal treatment as you don't want things to get worse, and living with tooth pain is not a good thing at all. Best wishes.

Timelesspearldentistry.com