Hello sir , do hot water fermentation soon after that do stretching you will get relief
Trapezius stretch
1) sit on a chair, catch the base of the chair with the hand which is same side of pain now bend your head side ways opposite to your head ,you will feel stretch in your trapezoid with little pain.
2) keep your forearms together like namasthe pose with elbows and palms touching.
Next Steps
you can visit physiotherapy clinic ultrasound therapy and manual therapy is good.
Health Tips
avoid lifting weights which strain the muscle.You can use cold packs either.