Rotator cuff tear and tendinitis shouldnt be ignored at all. You should consult with a pain management specialist for further management.
Initially medicines should be given but if it isnt giving relief then Platelet rich plasma therapy will be helpful in these cases.
Next Steps
Continue your routine activities but dont lift heavy weights.
Health Tips
Use Volini etc 2-3 times a day. Dont ignore this pain if it isnt cured in next 2 weeks and consult with a doctor.