fainted and rumours

around a week ago, i fainted in a lesson. i think i have low iron, and was feeling quite dizzy. however, a friend said to the TA/office lady that i hadnt eaten that day, in front of the whole class while i was passed out. i always eat breakfast, but if i leave school early during afternoon free periods i wont eat lunch until i get home (around 2:30/3). i dont tend to eat much at school, because its cheaper to eat at home, but i always have three meals a day.
but now since fainting i feel like everyone thinks that im not eating enough, and is judging what im eating. a girl im not even that close with told me ‘good’ when she saw me eating a croissant, and said that i ‘need to eat more’. another girl keeps telling me to eat. for reference, im 5ft 2 and around 48 kilos - so not worryingly thin or anything. i dont know what to do to stop people talking about what im eating, and i just want everyone to stop talking about me.
im grateful for any advice xx