I just read your story, about half way through reading i was hoping to find it was a joke and was lookin forward to the punch line. Any ways glad you survived and recovering ok.
i also had a chemical reaction a couple of months ago, i was changing the chemicals in the jacuzzi, i was emptying a little PH- from the almost empty plastic bottle into a new container of PH- but as i did so the chemical started to bubble up violently, this had never happened before. The mixed chemical also got very hot so i let it cool down and put it to one side and used a completely different bottle of PH-
Later i found out that the new bottle actually had PH+ in it, incorrectly labelled by the supplier! DOH!!