Demi is correct, I believe, that your baby may be strong enough to excrete any mercury (from your milk) safely. If it were me, though, I would start giving him a wee bit of high-quality probiotics every day. You may have to do a bit of research on this. Heaven knows, there is no shortage of it on the www, but you need to get many different points of view. After all is said & done, however, our health ultimately comes down to our GUT, i.e., the beneficial bacteria that reside there, or which are trying to reside there.

Best of luck and don't panic about your or your child's health. Just keep getting good advice from Russ and the others and realize that you can and will be cured. It may be slow - it has to be, with mercury - but you'll do it.