I don't think it's possible for me to hurt any more than I do now... Help?

Take some ibuprofen. It will help the pain and swelling all over. Put ice on your back and shoulders for the swelling. If the muscles hurt later, try heat. And your feet? All I can say is stay off of them and don't wear shoes if you can help it-that happened to me when I wore 5" heels for too long at my Grandma's funeral, and my feet didn't feel back to normal for like, a week. I could stand better after a few days though. Oh, and elevate your feet if they swell. Hope I helped.