Don't know, but I have read that, with that particular supplement, it is better to take less than the usual recommended dose, rather than more. I take lots of nonprescription vitamins and herbs myself, so I have nothing against it, but if something is an active agent that can actually help you, then it can probably hurt you too. The stated reason for sticking to low doses of NAC was that, in the doses often recommended (and I can't be specific, because it was too long ago and I don't remember the numbers), it can act as an oxidant rather than as an antioxidant. In any case, I think you are going to have to wait and see how long it takes for your edema to completely resolve. As long as this was a one-time thing, I'm guessing that it will completely resolve, but I'm only guessing. I'm not any kind of doctor. As for whether diuretics would help, I think that is definitely a question to ask your treating physician. You will need a prescription for a diuretic if it is indicated, so you will have to talk to someone with prescription priviledges regardless. In case you are thinking about taking some kind of "natural" diuretic, I personally would avoid self-treatment for the time being. You need a cardiologist or internist to advise you. Good luck with this, and be careful.
sorry I didn't mention that it was 1000mg of N Acetylcysteine