That is quite a bit if roughfage for you.did you peel the skin off the tomatoe? Raw veggies can upset the tummy easily.that is mostly fiber too. You could have a food intolerance as mentioned by patient 915. Take it easy on the natures way and decide if it is worth it.
Welcome to the gastroenterology community! You might have a food intolerance to one of those foods. Do tomatoes or onions normally bother you?