Sorry you got sick. Do you know what may have caused it?
I would expect you breathed some mist from contaminated water. Were you using a scuba reg or FFM or helmet? It may be wise to dive fully encapsulated with double exhausts, etc to keep from getting a re-occurence.
I dove a marina fire that destroyed about 80 boats looking to recover evidence on whatever may have started the first boat fire.The site was heavily polluted with fuel, hydraulic fluid, acid and holding tank slop, cinders, etc. that was contained by oil booms. I had charred wood get into my exhaust valve and I could feel mist entering my hat. I had to terminate my diving. I ended up doing the workmans comp thing as well. Live and learn. I would no longer dive that environment with the same gear.
Not sure what chemicals I was in but even after breaking down my equipment and decontaminating it, all my exhaust valve seals went from being flexible and supple to having the consistency of old newspaper by the next day. No telling what it did to my lungs.