Foam rolling and hamstring stretches have made a huge difference for me. I teach cardio and strength training classes and I was always terrible about stretching. I found that my hamstrings and glute muscle on my right was so tight it would put strain on my low back and I was repeatedly straining it. Quite a few times I would strain it to the point of not being to stand up straight for days.
I went to a lecture at a fitness conference last year and attended a fascia class. So interesting! Apparently most people are foam rolling too fast and not spending enough time working through the adhesions that occur in the fascia.
I foam roll (slowly) on my hamstrings, gluten, hips and quadriceps every night while watching tv with my family. So much better!
I hope it gets better for you! I totally understand how frustrating it is. I was worried I was going to have to give up teaching but I'm not ready to do that yet
Laura