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Blomdor No worries, I hope you weren't sick for too long. I've underestimated my kava in the past to the point of getting sick, nausea always disappeared after the upchuck though. I am still real susceptible to kava nausea, benadryl taken about a half hour before kava has been preventing it, but seriously increases the sedative effects. Now when I prep my kava, I always mix the second wash in with the first, take smaller shells than before, and space them apart about 30-40 minutes. No more surprises, and my sessions are a lot more relaxing now.
The gritty black stuff at the bottom of your grog is probably "sand," little bits of root bark that got ground in with the rest of the root. I mostly drink Boroguru and always have the sand in my cup/bowl.