I am still loving your TR!
So, I love the D&B bag...and glad the strawberries didn't give you an allergic reaction!
As for how I eat at WDW? I think I have the same issue. I try to drink 1500mL of water a day and when I'm in Florida and drinking that, it all just seems to float around my body until I return home. Add the water retention to all the salt, and there you go, instant bloating. My youngest is a competitive swimmer who is in the pool 16 hours a week. I looked at photos from our last trip and was shocked that even he was retaining more fluid and looked more solid.
I don't think it is you -- just the weird and delightful situation of being at WDW around all the food.