Remedies for Tight Sore Muscles?!

So I'm working on a tour and I'm usually at a desk job but two weeks out of the year I'm in the field. I walked 12 miles in finished total after the show ended tonight. My feet are blistered and hurt but that I can handle. What I'm not able to handle is how tight and sore my shoulders are. I can barely move it hurts so add to it the fact I'm sleeping on a tour bus in a bunk bed. Tonight is first show and I can't get to muscle relaxers and my electro therapy didn't help. I really need something so I can function doing my job.