Health food gone wrong...
I've had a few experiences
Recently I put a lot of Brewer's Yeast on my salad before bed, and it made me super sick. I already had ground flax seed on the salad (I have ground flax seed every morning usually with no trouble). Anyway, I also took a multi-vitamin, and I really think it was that Brewer's Yeast on top of everything that did me in. I lay in bed feeling nauseous and cramped.
Then there was the time I started having dried goji berries every morning. Horrible cramping that immediately resolved itself once I put two and two together. Some people have that reaction and there can be drug interactions. The Internet always help figure these things out.
Whenever we try something new, there's the possibility of a wonderful new discovery that's added to the routine or there's the possibility of a bout of feeling like crap!