Hello & welcome,
If you are getting these symptoms immediately after starting use of mouthwash, first priority is to stop the use of mouthwash immediately.
Mouthwashes generally contains alcohol along with
chlorhexidine gluconate,( 0.20% w/v) & sodium
fluoride 0.05% or
zinc chloride 0.09%. You may be allergic or hyper-sensitive to any of these con-taints in the mouthwash.
Instead don't use any mouthwash unless this condition resolves completely. Visit your
dentist if the condition get worse even after stopping the use of mouthwash.
You can ask your dentist to prescribe any other non-alcohol mouthwash (like wokadine or
betadine) but use that for short period ,too.
Avoid intake of hot & spicy food stuff along with tea or coffee as all these can add to the feeling of being burnt.
Take care.