In my opinion u need to start with physiotherapy along with supplement medications... avoid having steroidal injection or any kind of steroidal tablets...as these will deteorate your condition if u take it for long period of time...there are certain kind of medications which help in supporting and maintaining ur condition..kindly consult an Orthopedic for that...start physiotherapy immediately like wax bath / hot pack / US / TENS
Next Steps
Consult a Orthopedic for the medications and physiotherapist for applying modalities followed by basic exs...
Health Tips
Do not go for steroids...
Kindly do flour kneading , writing exs , rinsing clothes if u have pain in hands and fingers...