i'm on a gluten challenge too (for celiac, not EE). I had the same deal....I would eat a crumb of gluten and be in agony for days. It took me about a week on the diet to start feeling bad. I think it's because I overwhelmed my system with so much gluten, it went into shock and couldn't react to every piece of gluten passing through my system, whereas when I get glutened, my system has time to react to the crumb. That's my highly opinionated idea.
So I've had quite an intense couple of years in terms of destroying myself physically. I was a year-round swimmer, practicing 5 days a week for an hour and a half each day, and I injured my shoulder. Nine months of physical therapy concurrent with training, and no progress. So I quite swimming, and the shoulder problems only got worse. My shoulder popped almost constantly, and hurt all the time. This fall, I underwent surgery on that shoulder and was diagnosed with chronic subluxation (basically my shoulder popped in and out of socket dozens of times a day). Now I'm in physical therapy and having both shoulders treated because the other one pops constantly, much as the other did. My right shoulder's now doing the popping thing again so I have no clue what's going on there.
Long story short, I'm obviously not getting much exercise because everything hurts my shoulders. The other day, my mom brought me to the arthritis water aerobics class at the YMCA, which she said has really helped her arthritis (basically, everyone in my family has or has had arthritis. Grandmother had ankylosing spondylitis, Mom's got osteoarthritis, Dad has gout, Aunt has really bad arthritis in her knee). So I went and was being really careful of my shoulders, etc. After class, my hips started to hurt, and by the end of the day, I was having problems walking. This was yesterday, and now, even sitting here, I'm in pain. it actually feels better when I walk, but I can't walk fast and I can't spread my legs to stretch them.
I'm out of shape, to some extent, but I'm not that far out of shape. My mom is more out of shape than me, and she had absolutely no pain. I'm also only just turned 18. I haven't been glutened recently (last time was a few weeks ago though) and I don't think it's that, so I'm wondering if it's some added side effect of being gluten intolerant, or if it could be something else.