Maybe I can inform a little bit about neoprene. Basically, like others mentioned, there are some chemicals involved in making neoprene, maybe the nastiest of which are the glues. I'm a Canadian living in Taiwan and a year or so back I started thinking about having a neoprene mask made (the kind where you can insert a filter). In the process, I learned that some factories can offer you a very good price, but the cheaper price often results in a product that causes the same of kind reactions you guys are talking about. A LOT of manufacturers in China will use the most toxic materials when making neoprene, because it is cheaper (sorry to rag on China). Most buyers know this though, and they continue to purchase, because of the lower cost. Find out where your wetsuite was made. You have a better chance of the material being safe (the safest is where they use 3M glues), if it is made somewhere like Taiwan or Korea.
Be safe!
Linden (gflowmask)