I do remember you mentioning this, can't remember if I commented. Did you ever figure out what happened? Do you still have problems with your back?
My DH had injured his back 2 weeks before the trip and had been seeing a chiropractor for treatment. He was feeling pretty good when we left, but I think the stress of the unknown (he get's a little frazzled going to new places), and lugging our luggage and sitting on the plane for 3 hours aggravated it. I'll never forget this, when we got into our room he collapsed on the bed and said, "can we go home now?" I felt so bad for him! We didn't think to visit a doctor, but I had brought along aspirin and made an icepack out of one of my cosmetics bags. So between icing, hangin' in the hot tub, alcohol, and a little local medicine

he was feeling better by day 3 and enjoying the relaxing atmosphere. THANK GOODNESS THERE WERE NO KIDS AROUND!!