The gland on the left side of my neck got swollen all of the sudden, I must say I am perfectly healthy and exercise regularly, have excellent digestion, etc. The only thing I've done differently is that I drank some water that had been purified with some pills containing toluene sulphachloramide..Is it possible that this is some kind of allergic reaction to this substance?? I've stopped using it but just now so maybe it's too ealry to tell,. I know, but I just wanted to know if it is possible