Hum... having never used turmeric myself, I can't say what's happening, but it sounds like you're cleaning out your spleen.
And the parasites there aren't liking it. I'd say work your way into the turmeric slower---if you're using 3 caps, down to two, etc. until the discomfort eases.
I said turmeric is SLOW to kill everything, which is going to mean it's gonna hurt more. Sorry if you prefer to suffer a little. The zapper works way much faster. Hey, you could always zap a couple times and then switch to turmeric give the parasite killing a head start. It wouldn't hurt as much, I bet.