Don't be in such a rush ... it's sort of like a papercut across your knuckle. If you keep bending that knuckle, it takes forever to heal, right? But if you were to tape a popscicle stick to it, it would heal within a few days.
Same thing with your back. And your legs aren't going to wither away into stickland in a matter of a few weeks.
Stick to the McKenzie exercises for now. After a few days, add in some static (
) hamstring stretching (preferably in supine ... try the doorway stretch, it's a good one) and possibly gluteal/piriformis stretching as well.
When your symptoms are GONE, post again and I'll tell you where to go from there. At 24, you want to step back and take care of this NOW.