You are very fortunate your gluten-related symptoms resolved so quickly! Joint pain vanishing in 48 hours?---never happens that fast---not that I have heard anyway.
Really? The joint pain was the main reason I decided to try gluten free. I had constant sharp pain in my knee for 4-5 weeks before seeing a doctor who looked at it for 30 seconds and told me I had arthritis... "you're kinda young for arthritis" he said, then told me all I could do was take Advil 4 times a day for the rest of my life.
I then researched gluten free diet for about a week and prepared myself. It was the holiday season so I waited until Jan 1st (seemed appropriate). Jan 2nd my knee felt significantly better and on the 3rd there was no pain at all, and none since. The weight loss and sleep was a bonus I was not expecting.
You know what really surprised me however? 3 months into the diet I was visiting my father and talking about it. He said to me "well that makes sense because you always had trouble with wheat when you were little." I had forgotten all about that but it was true! I felt sick after eating certain pancake mixes, dark wheat bread and certain cereals like wheat checks and wheaties.... even to this day I avoided them but never put two and two together.