I've just taken 1x 250mg of Naproxen, I don't take them very often just during bad pain moments. Anyway, i had a bowl of cereal before I took it as they are an anti inflammatory, BUT I now have the most awful pains , like a really sharp stabby pain in ym tummy. I cannot remember now if I got this the last time I took them. Does anyone else take it and get pains and if so what can shift it