Merry Christmas And I Am Currently Taking Amoxicillin 500 Mg,

merry christmas and I am currently taking amoxicillin 500 mg, ( days) Have take this drug before without any problems however yesterday i had really bad cramps and nausea an hour or so after taking my scheduled dose. Have had the cramps 3 of the 5 days, and wonder it ispossible that yogurt or metamucil could have caused the amoxi to react in that fashion?