Joints and connective tissue can get inflamed, muscles can get pulled, strained or damaged, and nerves can be pinched or irritated. The whole mess causes swelling, imflammation and tightness, among other things. Find out which it is, and treat it accordingly.

It's possible you can be recovered enough for your hard ride this coming weekend, depending on what's going on. I'd work on stretching/foam roller, The Stick and/or Theracane, use ice, lots of ibuprofen, and easy bike rides to gradually test out what effort feels like. Heat feels good, but ice actually reduces pain, swelling and inflammation.

But then, I'm just talking out of my ass here...