HELLO AND WELCOME TO HCM FORUM NAAZMAN,
i am glad you wrote in, first of all i would like to inform you that the pain following the 2nd sitting for root canal treatment
is sometimes temporary, but if in case the pain persists beyond 5-7 days, then it is advisable to do a re-RCT on the same tooth as well as check the surrounding teeth for infection.
i assume your dentist
has prescribed you an analgesic
for relieving the pain, but as i mentioned, if pain does not subside even after taking a painkiller, then the tooth might need to be re-treated.
also, the rough surface is due to the tooth cutting which is done during or after the root canal treatment to make space for a crown, do not worry, crown will cover your tooth and take care of this problem well.
i hope i answered your query,
i wish you good health.