I have the same chemical sensitivities also and know what you are dealing with ,I can't be around my wife when she is wearing any type of fragerance ,It will give me an instant headach and have a hard time breathing ,as for the social events you may want to start a small part time business ( for example: handyman or something that you are good at and feel comfortable doing for other people) this will give you an excuse to miss the next social function because you are trying to get you your new business started , most people will understand this ,instead of tring to explain about your chemical sensitivity or mercury toxicity.