hello and welcome,
Root canal treatment
is carried out under local anaesthesia to relieve pain while removing infected vital pulp.
The complication associated with RCT, depends on the case.
Usually,during this treatment,fever
Ingestion of a small quantity of local anaesthtic solution is not hazardous.
The complication post-rct is usually less severe,if the procedure is carried out properly.
Trust on your dentist
and hope for the best.
Nauseous feeling can be suppressed using anti-emetics.