Welcome to HCM
You are having two medical problem one is RA(Rheumatoid Arthritis
and not Rheumatic Arthritis) as you are taking drugs for 12 years and your disease should be controlled.
Another problem is MVP
( Mitral valve Prolapse
) as you are having papitations in the form of fast heart beats,it could be because of MVP which can cause various tachycardia
In his a mitral valve leaflet is longer and prolapses is left atrium (Chamber of heart) hence there is minor leak from valve.In this condition no surgery is required usually.Other causes could be hyperthyroid state and to know exact association with palpitation
of tachycardia a ambulatory recording may be done called ho;ter monitoring.
For palpitations in consultation of cardiologist Beta blockers may be given to control symptoms.
Good luck to you