If conservative treatment means physiotherapy is not giving you good result then you should go for Arthroscopic surgery after proper shoulder examination . Frozen shoulder is not due to tear

As per your age, u should undergo surgery Benefits are more than treating it with non surgical methods

This treatment is being suggested on bases of the information provided. However I would like to examine & investigate you  in detail. -Control  Hypertension, Diabetes or  metabolic disorder, if there is any. --. Sleep on a hard bed with soft bedding. --. Keep no  pillow under the head. --. Avoid painful acts & activities. --. Fomentation with warm water. Let the part not be exposed to cold. -- .Do mild exercises for neck and upper limbs. --.visit my YouTube channel 'DrN C Gupta' and watch 'Me & My Yoga' and 'Yoga Simplified'. Kindly subscribe to the channel to get continuous guidence & notifications. It is free. --or else contact a physiotherapist. https://youtube.com/channel/UCPEQc6B1ywzwin048JSu6rw -Any way it may be tried, --. Ugesic (Piroxicam) 20mg 1 tab once a day x 5days --. Caldikind plus  (Mankind) 1 tab Once  a day x 10 days. -(You may need help of your local doctor to get these medicines.) Kindly make sure, there is no allergy to any of these medicines. --For emergency treatment visit nearest hospital. --Wish you a quick recovery & good health. Dr N C Gupta MS (ortho.) DMC no.3624 Thanks.

Frozen shoulder is an entirely different diagnosis. Are u diabetic? Its usually a self limiting condition which improves with time with appropriate treatment.