Thanks for asking the query,
According to your clinical history i suppose that the above symptoms which you have is due to reinfection in the root canal
treated tooth, I would suggest you to visit the Dentist
and get the checkup done take an x-ray of the tooth, depending upon which the treatment will be re-RCT or extraction of the tooth.
Go for complete mouth scaling and polishing.
Take complete course of antibiotics and anlgesics.
Maintain a good oral hygiene
, use antiseptic mouthwash gargles twice.
For other problems you are facing you can visit ENT Specialist
and get the checkup done.
Hope this helps out.