I'm feeling better now (knock on wood). I asked my doctor about Algin and he was not familiar with it but he didn't think that it would hurt to try it. I might order some of that soon.

I'll get some vitamin C to take orally and see what that
does.

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I would definitely take a lot of vitamin C orally as soon as possible. I personally would take at least 6 to 8,000 milligrams (6 to 8 grams) right away. You'll probably need to continue taking high amounts of vitamin C over the next 48 hours or so. See how you feel and adjust as needed.

Also, if you have any Algin, take a bunch of it (apart from the vitamin C). This will help absorb what the DMPS has chelated. The fact that you're experiencing these side-effects would suggest that you're reabsorbing mercury.

If you don't have Algin, then use Slippery Elm, and again, lots of it. Keep your bowels moving with lots of liquid. Stay away from fish and possibly even sulphur-bearing foods like eggs (which can be problematic for some mercury toxic people).