scared to eat after not being able to keep food down

i found out that i had piles, and in response as soon as i found out the next day an hour oor so after lunch i chopped up one apple and one pear, put them in a bowl and then ate them. when it came to around about 6 i had a small pain in my stomach that gradually grew (which i thought was just gas), however once i had fallen asleep for a while the pain went for about an hour. after this at around 10 i was sick really badly, where preety much all of the aplle and pear had come out. once i had had a shower and cleaned up i drank some water just to help a little, and then half an hour after that i just regurgitated the water. the next day i had a massive headache and could barely walk, but that sorted itself out toward the end of the day; yet i am still scared to eat much food as i think it might come out later, which makes it really difficult to take any real amounts of food in, please help, if i could just know why i was sick then im sure it would put my mind at ease.