Sorry I haven't heard your grumblings before this, so this might be a dumb question, but have you tried massage? I was having a lot of issues with tight/achy/downright painful muscles and it turns out it's a bunch (and I mean a BUNCH) of trigger points.

I picked up The Trigger Point Therapy Workbook Second Edition by Clair Davies, and it's been very helpful and informative. I'm certainly no expert, but it's an alternative if you want one.

Best of luck.