Foam roll it. Tennis ball it. Pay for a professional to look at it. If you've pulled/torn to an extent where it feels like an injury, not just muscle soreness, you shouldn't be stretching it too much as it doesn't pay to stretch a tear.
I wouldn't just focus on that area either. Do your glutes, hips and lower back as well.
If you're taking time off workouts, use that time to research and learn more about the muscles, makes it easier to tell a professional what you think is up.